There are 18 books in the Quiller series. The newest book is Quiller Salamander which came out in 1994.

1
The Quiller Memorandum

Book cover of The Quiller Memorandum

You are a secret agent working for the British in Berlin. You are due to go home on leave, but you are being followed-by your own people, or by the enemy. A man meets you in the theater and briefs you on a plot to revive the power of Nazi…
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5
The Tango Briefing

Book cover of The Tango Briefing
Quiller, the Bureau's top intelligence agent, faces the toughest assignment of his career--a job that takes him to the Sahara Desert to locate a downed plane, photograph its crew, and identify its cargo. Reprint. NYT.

8
The Sinkiang Executive

Book cover of The Sinkiang Executive
When satellite cameras pick up a strange new missile complex in Yelingrad, a frozen city on the Russo-Chinese border, Quiller, the Bureau's top intelligence agent, is sent to investigate. Reprint. NYT.

9
The Scorpion Signal

Book cover of The Scorpion Signal
The indefatigable Quiller rescues a fellow agent from the KGB, but not before he has revealed what British and American intelligence sources know of Soviet military defenses, and Quiller must later thwart his efforts to assassinate Brezhnev

11
Quiller

Book cover of Quiller
Secret agent Quiller is back in this heart-stopping spy thriller. Quiller must work against his own instincts to save a world on the verge of disaster. From behind the Iron Curtain, in a city where he has no place to hide, he must trust a woman who cannot be trusted…

12
Quiller's Run

Book cover of Quiller's Run
After quitting the Bureau and undertaking a dangerous freelance mission, Quiller heads for a lethal showdown with Mariko, a delicate Cambodian beauty who possesses a deadly embrace. Reprint.

13
Quiller KGB

Book cover of Quiller KGB
Quiller is asked by London's Bureau to accept a mission with a completely new twist: to work with Russia's formidable and ruthless KGB. The Soviet Union's charismatic leader is headed for a diplomatic visit to East Berlin at a time when tensions surrounding the hated Berlin Wall are at their…

14
Quiller Barracuda

Book cover of Quiller Barracuda
British agent Quiller must extricate a Miami-stationed agent from a twisted enemy conspiracy that involves incredible mind-control technology and may reach as far as the President of the United States

15
Quiller Bamboo

Book cover of Quiller Bamboo
Quiller journeys to China to protect a venerable, renowned philosopher, the pivot of a plan to overthrow the Chinese government, from secret efforts to brainwash him

16
Quiller Solitaire

Book cover of Quiller Solitaire
Quiller's survival skills have never been so crucial as in this eerily prophetic mission torn from today's headlines. Standing over the smoldering corpse of the agent he had sworn to protect, Quiller vows to make things right. The killer's trail leads to a terrorist network targeting the next American flight…

17
Quiller Meridian

Book cover of Quiller Meridian
Following the death of a fellow agent, Quiller must locate a missing Russian agent--a mission that takes him on a deadly train trip across the former Soviet Union. By the author of Quiller Solitaire. 30,000 first printing. $20,000 ad/promo.

18
Quiller Salamander

Book cover of Quiller Salamander
The sequel to Quiller Meridien follows Quiller into the Cambodian jungle as he attempts to prevent the notorious Pol Pot from maneuvering the dreaded Khmer Rouge back into power.