There are 190 books in the The Hardy Boys series. The newest book is Motocross Madness .

1
The Tower Treasure

Book cover of The Tower Treasure
A special treat for Hardy Boys fans and any reader who's new to the series! We're releasing a cool new edition of an old favourite: The Tower Treasure, the first book in the incredibly popular, long-running series. In this classic adventure, Frank and Joe Hardy work together to solve a…
When you buy books, we may earn a commission that helps keep our lights on (or join the rebellion as a member).

2
The House on the Cliff

Book cover of The House on the Cliff
Frank and Joe Hardy are investigating a mysterious old house high on the cliffs above Barmet Bay when they are frightened off by a scream. The boys return to the apparently haunted house when they make a connection between the place and a smuggling case their father is working on.…

3
The Secret of the Old Mill

Book cover of The Secret of the Old Mill
With two cases in tow, the Hardy boys look to Turner mill for clues. Determined to learn the secret of the old mill, Frank and Joe employ a clever ruse to gain entrance, only to find themselves trapped. How the young detectives extricate themselves from this dangerous situation and unravel…

4
The Missing Chums

Book cover of The Missing Chums
Not only is the local bank robbed, but two of the Hardy boys' pals mysteriously disappear after a masquerade party. Are the events related? How the Hardy boys use all their courage and skill to outwit the criminals provides an exciting climax to one of the most baffling mysteries the…

5
Hunting for Hidden Gold

Book cover of Hunting for Hidden Gold
Timber wolves, a Rocky Mountain blizzard, and a mine cave-in are only a few of the perils Frank and Joe Hardy encounter during their search for the principal members of a notorious gang responsible for a payroll robbery. Clue by clue, Frank and Joe cleverly fit into place the scattered…

6
The Shore Road Mystery

Book cover of The Shore Road Mystery
When the Hardy Boys eagerly agree to assist their friend Jack Dodd and his father in locating a family treasure, the two young detectives are unaware of the baffling complications that will arise. Deadly road traps, aerial ambush, a spider man and a suspect who carries a menacing cane harass…

7
The Secret of the Caves

Book cover of The Secret of the Caves
Triggered by the disappearance of a brilliant young professor, this mystery takes the Hardy boys first to Kenworthy College, where they find a puzzling message on an examination paper. But then, a new clue is unearthed that sends the young detectives to the Honeycomb Caves. After many dangerous encounters,  Frank…

8
The Mystery of Cabin Island

Book cover of The Mystery of Cabin Island
The Hardy Boys series, first published in 1927, has sold more than 70 million copies!

Now with a brand-new look, this is an edition that collectors won't want to miss! In The Mystery of Cabin Island, the eighth book in the incredibly popular, long-running series, Frank and Joe Hardy encounter…

9
The Great Airport Mystery

Book cover of The Great Airport Mystery
Valuable electronic parts containing platinum are being stolen from shipments made by Stanwide Mining Equipment’s cargo planes, and Frank and Joe are called upon to assist their world-renowned detective father solve the baffling case. While posing as Stanwide employees, the boys look into the truth behind the chief pilot’s death…

10
What Happened at Midnight

Book cover of What Happened at Midnight
Frank and Joe race against time to retrieve a scientist’s top-secret invention before thieves get their hands on it. But the young detectives soon discover that they are involved in a mystery far greater in scope than just safeguarding the invention. When Joe is kidnapped, this incident starts Frank of…

11
While the Clock Ticked

Book cover of While the Clock Ticked
A banker who has been receiving threatening notes enlists the help of the Hardy boys. Before long, the young sleuths find themselves entangled in the investigation of a notorious band of thieves.

12
Footprints Under the Window

Book cover of Footprints Under the Window
A plot to steal a top-secret instrument vital to the United States space program poses a challenging case for Frank and Joe Hardy. After rescuing a South American stowaway who mutters a warning about “Footprints “ and then vanishes, Frank and Joe discover that documents belonging to their famous detective…

13
The Mark on the Door

Book cover of The Mark on the Door
In their motorboat the Sleuth Frank and Joe Hardy search Barmet Bay for a dangerous stranger who has stolen a valuable boat. Suddenly, in the eerie fog, they spot the craft drifting aimlessly out to sea. What happens next starts the young detectives and their pal Chet Morton on an…

14
The Hidden Harbor Mystery

Book cover of The Hidden Harbor Mystery
The boys once again have jumped into the thick of a complicated mystery. Samuel Blacksone and his brother Ruel Rand live on adjacent properties, and it appears that one of them is out to hurt the other because they are both attacked. Frank and Joe soon learn that treasure is…

15
The Sinister Signpost

Book cover of The Sinister Signpost
In one of the most dangerous and intriguing cases of their careers, Frank and Joe Hardy help their father investigate a series of mysterious car accidents. Each of the drivers had seen a signpost marked DANGER shortly before his accident. The young detectives investigate, only to discover that the signposts…

16
A Figure in Hiding

Book cover of A Figure in Hiding
A blind peddler’s warning and a weird glass eye plunge Frank and Joe Hardy into one of the most baffling cases they have ever tackled. The young detectives’ investigation takes them to a walled estate guarded by savage dogs, where a wealthy businessman is hiding out in fear for his…

17
The Secret Warning

Book cover of The Secret Warning
Strange events involve Frank and Joe Hardy in a mystery which shrouds an ancient treasure—the golden head of the Pharaoh Rhamaton IV. The owner of the million-dollar golden Pharaoh’s head claims it was aboard the freighter Katawa, which sank not far from Whalebone Island. But suspicious developments indicate that Mehmet…

18
The Twisted Claw

Book cover of The Twisted Claw
A series of museum thefts launch the Hardy Boys on this baffling mystery. Rare collections of ancient pirate treasure are being stolen, so Frank and Joe are asked to stake out the Black Parrot, a suspicious freighter docked in Bayport Harbor. This whirlwind chase after a self-styled pirate king in…

19
The Disappearing Floor

Book cover of The Disappearing Floor
Once again Frank and Joe Hardy take on a puzzling case when their famous detective father asks the boys to assist him in tracking down a notorious jewel thief and his accomplices. The trail leads to the outskirts of the Hardys’ home town and to a weirdly guarded mansion on…

20
Mystery of the Flying Express

Book cover of Mystery of the Flying Express
A sleek new hydrofoil is scheduled to start ferrying passengers between Bayport and Cape Cutlass. But business enemies of the hydrofoil owner have stirred up a hornets’ nest of violent opposition among small boat owners. Fearing sabotage, he begs Frank and Joe Hardy to guard the Flying Express on her…

21
The Clue of the Broken Blade

Book cover of The Clue of the Broken Blade
Frank and Joe Hardy become involved in an intriguing mystery which revolves around their fencing master, Ettore Russo. Proof that Russo is the rightful heir to his grandfather’s estate hinges on retrieving the guard end of a broken saber lost many years ago in California. The young investigators’ quest is…

22
The Flickering Torch Mystery

Book cover of The Flickering Torch Mystery
Two unexplainable plane crashes near an airport on the East Coast plunge Frank and Joe Hardy into a bizarre case. From the moment Frank and Joe find a radioactive engine in an airplane junkyard, unexpected dangers strike like lightning. Despite the repeated attempts on their lives, the teenage detectives pursue…

23
The Melted Coins

Book cover of The Melted Coins
Frank and Joe Hardy suspect that their best friend Chet Morton is the victim of a summer school swindle and offer to help get his money back. While probing a baffling burglary at the Seneca Indian Reservation in New York State they investigate Zoar College located nearby. A startling connection…

24
The Short-Wave Mystery

Book cover of The Short-Wave Mystery
When thieves hijack a collection of stuffed animals from a country auction, Frank and Joe Hardy pursue the getaway car and are drawn into a thrilling mystery. At the same time, the young detectives’ father—famed private investigator Fenton Hardy—is tracking down an industrial spy ring. This suspense-filled story of pursuit…

25
The Secret Panel

Book cover of The Secret Panel
Another exciting mystery begins for Frank and Joe when they help a stranger who has had an accident with his car. The man introduces himself as John Mead, owner of a nearby estate. But when the Hardy boys find an odd-looking house key and try to return it, they realize…

26
The Phantom Freighter

Book cover of The Phantom Freighter
When eccentric Thaddeus McClintock invites Frank and Joe Hardy to accompany him on a sea voyage, the teenage investigators become entangled in a web of mystery. Who is trying to block the three from securing reservation on freighter ships that carry passengers? The determined efforts of Frank and Joe lead…

27
The Secret of Skull Mountain

Book cover of The Secret of Skull Mountain
There is a crisis in Bayport! Soon the city will be without water! Every night, water strangely disappears from the new reservoir near Skull Mountain. Frank and Joe Hardy join forces with a team of skilled engineers to solve the baffling mystery.

28
The Sign of the Crooked Arrow

Book cover of The Sign of the Crooked Arrow
With only the slender clue of an arrow-shaped tie clasp, Frank and Joe Hardy pick up the trail of a cunning gang of thieves responsible for a wave of jewelry-store holdups. But their investigations are interrupted when a desperate plea for help comes from their widowed cousin who lives on…

29
The Secret of the Lost Tunnel

Book cover of The Secret of the Lost Tunnel
Difficult assignments are nothing new to the Hardy boys and this one that takes them to the Deep South is particularly challenging. Their mission: to vindicate a long-dead Confederate general, disgraced during the Civil War because he was accused of stealing hidden gold belonging to a bank.  Skillfully avoiding booby…

30
The Wailing Siren Mystery

Book cover of The Wailing Siren Mystery
Caught in their motorboat the Sleuth by a sudden storm at sea, Frank and Joe Hardy are relieved to see the lights of a yacht. But their SOS ignored. The shrill sound of a siren fills the night air and moments later a helicopter drops an object alongside the Sleuth:…

31
The Secret of Wildcat Swamp

Book cover of The Secret of Wildcat Swamp
An invitation from Cap Bailey, science teacher at Bayport High, to accompany him out West to Wildcat Swamp on an archaeological expedition triggers off a series of dangerous events for Frank and Joe Hardy. On their way West the boys and Cap have a near-fatal accident in a private plane…

32
The Crisscross Shadow

Book cover of The Crisscross Shadow
When a man selling leather goods door-to-door steals the key to their detective father’s file cabinet, Frank and Joe Hardy set out to track him down. An odd mark on a key case which the man sold to their mother leads the teenage sleuths to an Indian village, whose chiefs…

33
The Yellow Feather Mystery

Book cover of The Yellow Feather Mystery
The famous young detectives Frank and Joe Hardy are caught up in a dangerous web of intrigue when they agree to help Greg Woodson search for his grandfather’s missing will. When Henry Kurt, the temporary headmaster of Woodson Academy, insists that he is to inherit the property from Greg’s grandfather,…

34
The Hooded Hawk Mystery

Book cover of The Hooded Hawk Mystery
The young detectives receive a trained peregrine falcon as a gift that involves them in an exciting mystery. Imagine their astonishment when the swift-flying falcon brings down a homing pigeon carrying two precious rubies! Startling events that ensue indicate the gems are a ransom that has been paid for the…

35
The Clue in the Embers

Book cover of The Clue in the Embers
Tony Prito enlists the help of his detective friends Frank and Joe Hardy when a sinister stranger demands that Tony sell him the bizarre curio collection he has just inherited. While the boys are discussing this suspicious incident, the stranger, Valez, telephones and threatens Tony. That same afternoon the three…

36
The Secret of Pirates' Hill

Book cover of The Secret of Pirates' Hill
In a series of hair-raising adventures both on land and undersea the teenage brother detectives pit their wits against some of the most ruthless criminals they have ever encountered. It all starts when Frank and Joe are skin diving just for fun and the thrill of exploring the undersea world.…

37
The Ghost at Skeleton Rock

Book cover of The Ghost at Skeleton Rock
A cryptic message from their famous detective father and a note concealed in a ventriloquist’s dummy lead Frank and Joe Hardy on a dangerous search to the tropical islands in the Caribbean. There the teenage detectives are constantly beset by vicious henchmen of a criminal mastermind. Danger stalks the boys’…

38
The Mystery at Devil's Paw

Book cover of The Mystery at Devil's Paw
When Frank and Joe Hardy receive a telegram from Tony Prito in Alaska telling them that his life is in jeopardy, they immediately make plans to fly to Tony’s rescue.  Unknown enemies dog the Hardys and their pal Chet Morton even before they start the 4,000 mile journey. Puzzling questions…

39
The Mystery of the Chinese Junk

Book cover of The Mystery of the Chinese Junk
The Hardys purchase a Chinese junk to use as a ferry service, in order to make some money over the summer. It soon becomes apparent that others are very interested in the ship.

40
The Mystery of the Desert Giant

Book cover of The Mystery of the Desert Giant
In a search for the missing Willard Grafton, Frank Hardy and younger brother Joe, encounter a gang of criminals intent on defrauding the US government, and are lead across California and even into Mexico.

41
The Clue of the Screeching Owl

Book cover of The Clue of the Screeching Owl
When dogs and men suddenly disappear, and strange screams fill the night, fantastic stories of vengeful ghosts are almost believable. It is these strange happenings which bring Frank and Joe Hardy to the Pocono Mountains to help their father’s friend solve the mystery of Black Hollow. But when the Hardy…

42
The Viking Symbol Mystery

Book cover of The Viking Symbol Mystery
The Canadian Northwest beckons Frank and Joe Hardy to mystery and adventure. It all starts when a French-Canadian trapper, Caribou Caron, makes a historical and valuable find–-a carved rune stone left by Vikings centuries ago near Great Slave Lake. When Caribou Caron attempts to sell the artifact to a representative…

43
The Mystery of the Aztec Warrior

Book cover of The Mystery of the Aztec Warrior
The handwritten will of a deceased world-traveler is strange and mysterious. Its cryptic instructions are to deliver “the valuable Aztec warrior to the rightful owner, a descendant of an Aztec warrior.” Frank and Joe Hardy have only one slim clue to work with: the name of a complete stranger who…

44
The Haunted Fort

Book cover of The Haunted Fort
A long-distance telephone call from Chet Morton’s uncle summons Frank and Joe Hardy and their staunch pal Chet to a summer art school, located near old Fort Senandaga which is reputed to be inhabited by a ghost. The young detectives’ assignment: recover two famous oil paintings stolen from the valuable…

45
The Mystery of the Spiral Bridge

Book cover of The Mystery of the Spiral Bridge
Frank and Joe Hardy are determined to bring to justice the vicious criminals who kidnapped their detective father while he was investigation sabotage of a road-building project in the Kentucky wilderness. After Mr. Hardy’s escape, the two young sleuths are spurred into action when he mumbles the word “Felix” and…

46
The Secret Agent on Flight 101

Book cover of The Secret Agent on Flight 101
Rarely do magicians reveal their professional secrets. Consequently Frank and Joe Hardy are amazed when a well-known magician, the Incredible Hexton, offers to reveal the secret of his “Vanishing Man Act” and invited Mr. Hardy to be the subject. When their detective father fails to reappear, his sons are convinced…

47
Mystery of the Whale Tattoo

Book cover of Mystery of the Whale Tattoo
One exciting event follows another when Frank and Joe Hardy are hired to apprehend the pickpockets who have been plaguing Solo’s Super Carnival. When their friends Tony Prito and Biff Hooper exhibit a stuffed whale dug up at a construction project, they all but put the carnival out of business.…

48
The Arctic Patrol Mystery

Book cover of The Arctic Patrol Mystery
Private investigator Fenton Hardy enlists the aid of his teenage detective sons in a search for a missing man being sought by an insurance company. All leads to the sailor’s whereabouts have petered out and the boys fly to Iceland, the man’s native land, hoping to find a new clue.…

53
The Clue of the Hissing Serpent

Book cover of The Clue of the Hissing Serpent
Why is a wealthy sportsman so frightened by the serpent design on a mysterious balloon that he begs Frank and Joe Hardy to protect him? And who stole the ancient life-size chess king which is to be presented to the winner of the world chess championship? Targets of diabolical enemies,…

54
The Mysterious Caravan

Book cover of The Mysterious Caravan
When the Hardy Boys take a winter vacation in Jamaica, Joe finds an ancient bronze death mask washed up near their beach house during a violent storm. Helping the Hardys and their friends in this bizarre mystery is William, a Jamaican boy, who flies to New York with startling news,…

55
The Witchmaster's Key

Book cover of The Witchmaster's Key
There is not time for explanations when Mr. hardy telephones Frank and Joe form the West Coast and sends them flying off to England to help his old friend Professor Rowbotham. Their stay in East Anglia begins with a weird omen, as they witness the bizarre funeral of an old…

57
The Firebird Rocket

Book cover of The Firebird Rocket
The launching of the Firebird Rocket is endangered when a famous rocket scientist disappears without a trace on his way to the Woomera Monitoring Station in Australia. Assigned to the case, Fenton Hardy tells his sons he needs their help. And Frank and Joe must turn down a request that…

58
The Sting of the Scorpion

Book cover of The Sting of the Scorpion
During Mr. Hardy’s investigation of a ruthless gang of terrorists, Frank and Joe witness an explosion in the sky near an airborne dirigible owned by Quinn Air Fleet. The young detectives look into a clue that takes them into a new animal park outside Bayport, where they are lured into…

86
The Mystery of the Silver Star

Book cover of The Mystery of the Silver Star
When someone tries to use sabotage to prevent Keith from winning a cross-country bicycle race, he turns to the Hardy brothers for help

114
The Case of the Counterfeit Criminals

Book cover of The Case of the Counterfeit Criminals
Investigating the manufacture of defective athletic equipment at a local sporting goods store, Frank and Joe Hardy discover that someone is out to make a killing passing off defective sneakers. Original.

135
The Hypersonic Secret

Book cover of The Hypersonic Secret
Investigating the disappearance of an air taxi pilot, Frank and Joe uncover evidence of sabotage that points directly to the missing man's passenger, millionaire Ian Fairbanks, who is connected to a national conspiracy. Original.

141
The Desert Thieves

Book cover of The Desert Thieves
The Hardy Boys join their father on a trip to Arizona's magnificent Organ Pipe Cactus National Monument-a trip that becomes dangerous as they set out to find the black marketeers who are stealing rare cacti.

158
The London Deception

Book cover of The London Deception
Stage fright takes on a whole new meaning when the Hardys go behind the scenes.

While on a student exchange program in England, Frank and Joe help out with the dress rehearsal for a new murder-mystery play. But suddenly Joe is nearly cooked by exploding stage lights! An accident? Maybe.…