There are 10 books in the Pendragon series. The newest book is The Soldiers of Halla which came out in 2009.

Bobby Pendragon is a seemingly normal teenager, swept into an amazing quest, and catapulted into the middle of an immense, interdimensional conflict. His success or failure will decide the course of human existence! The first book of this internationally best-selling series, each featuring a new and dangerous mission.
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2
The Lost City of Faar

Book cover of The Lost City of Faar
In the second installment of the epic Pendragon adventures, Bobby and Uncle Press are off again - this time to stop an underwater war! Fresh from his adventures on Denduron, Bobby Pendragon suddenly finds himself in the territory of Cloral, a vast world that is entirely covered by water. Cloral…

3
The Never War

Book cover of The Never War
Bobby Pendragon has been busy leaping from territory to territory, following his mysterious uncle Press on his mission to save the world - all worlds - from the ultimate evil: Saint Dane. Now Bobby has returned to Earth - but something isn't quite right. The year is 1937 and our…

4
The Reality Bug

Book cover of The Reality Bug
When Bobby Pendragon arrives on Veelox in hot pursuit of the evil Saint Dane, he discovers that the territory has achieved perfect harmony. All is peaceful on Veelox - because it's deserted! The inhabitants have discovered a way to enter their own personal dream worlds, where they can be whoever…

5
Black Water

Book cover of Black Water
Bobby now finds himself in a beautiful, primitive territory called Eelong. It is covered in lush tropical jungle and inhabited by a ferocious half-human/half-cat species called Klee. There are humans on Eelong, called Gar, but they are one of the lower life-forms. In fact, on Eelong, humans are kept as…

6
The Rivers of Zadaa

Book cover of The Rivers of Zadaa
Bobby's adventure continues as he tries to save all of Halla from destruction. This time he's off to the land of Zadaa, where the traveller, Loor, lives. Saint Dane is set to instigate trouble between the two tribes that live here - the Batu and the Rokador. They are on…

7
The Quillan Games

Book cover of The Quillan Games
When Bobby Pendragon arrives on the territory of Quillan, he discovers a whole new meaning to the word competition! Quillan is heading for destruction, the people have lost control of their own future and are struggling just to survive. The only chance they have of finding a better life is…

8
The Pilgrims of Rayne

Book cover of The Pilgrims of Rayne
When Bobby Pendragon first arrives on the tropical world of Ibara, he finds paradise. There is beauty all around and the people of Ibara are blissfully happy. It's not long before Bobby discovers, however, that they are also blissfully...oblivious. The leaders of Ibara are keeping a devastating secret from their…

9
Raven Rise

Book cover of Raven Rise
Bobby Pendragon is trapped...with a single, massive explosion of Tak the entrance to the flume on Ibara was destroyed, sealing off any means of escape for Bobby, and his nemesis, Saint Dane. Even though he had given up all hope of ever returning to his old life, Bobby was ok.…

10
The Soldiers of Halla

Book cover of The Soldiers of Halla
Nine battles for nine territories have brought Bobby Pendragon to where he is now: The final showdown. Bobby and the rest of the travellers must join forces in an epic war against Saint Dane, not only for one last territory, but for all of Halla. Every secret is at last…