* The Death Merchant (1977)
* The Survivor (1978)
* The Midas Curse (1979)
* The Golden Eagle (1980)
* The Kremlin Conspiracy (1981)
* The Matarese Circle (1982)
* The Brethren (1984)
* The Cassandra Crossing (1984)
* The Covenant (1985)
* The Kremlin Code (1986)
* The Doomsday Virus (1987)
* The Icarus Agenda (1988)
* The Lazarus Effect (1989)
* The Prometheus Deception (1990)
* The Resurrection Day (1991)
* The Apocalypse Watch (1992)
* The Devil's Dominion (1993)
* The Uri Geller Legacy (1994)
* The Nostradamus Prophecy (1995)
* The Atlantis Enigma (1996)
* The Merlin Mystery (1997)
* The Templar Revelation (1998)
* The Galileo Gambit (1999)
* The Darwin Conspiracy (2000)
* The Einstein Prophecy (2001)
* The Nostradamus Legacy (2002)
* The Atlantis Project (2003)
* The Merlin Legacy (2004)
* The Templar Prophecy (2005)
* The Galileo Mission (2006)
* The Darwin Project (2007)
* The Einstein Enigma (2008)
* The Nostradamus Code (2009)
* The Atlantis Secret (2010)
* The Merlin Codex (2011)
* The Templar Treasure (2012)
* The Galileo Discovery (2013)
* The Darwin Legacy (2014)
* The Einstein Hypothesis (2015)
* The Nostradamus Codex (2016)
* The Atlantis Legacy (2017)
* The Merlin Prophecy (2018)
* The Templar Revelation (2019)
* The Galileo Mission (2020)
* The Darwin Project (2021)
* The Einstein Enigma (2022)
Non-fiction
* The CIA (1985)
* The KGB (1988)
* The SAS (1991)
* The Mossad (1994)
* The Delta Force (1996)
* The Secret Service (1998)
* The MI6 (2001)
* The FBI (2003)
* The CIA at War (2005)
* The KGB at War (2007)
* The SAS at War (2009)
* The Mossad at War (2011)
* The Delta Force at War (2013)
* The Secret Service at War (2015)
* The MI6 at War (2017)
* The FBI at War (2019)