* The Blue Umbrella (1978)
* Recursion (1979)
* The Scarlet Claw (1980)
* The Loch Ness Legacy (1982)
* The Siberian Affair (1983)
* The Omega Strain (1984)
* The China Option (1986)
* The Moscow Connection (1987)
* The Berlin Conspiracy (1989)
* The Istanbul Deception (1991)
* The Cairo Covenant (1992)
* The Karachi Conspiracy (1993)
* The Tokyo Payoff (1994)
* The Seoul Connection (1996)
* The Beijing Shadow (1998)
* The Moscow Gambit (2001)
* The Stockholm Syndrome (2004)
* The Odessa File (2007)
* The Warsaw Protocol (2009)
* The Budapest Gambit (2011)
* The Reykjavik Responsum (2014)
* The Helsinki Protocol (2016)
Non-fiction:
* The Second American Revolution (1973)
* The New Age (1982)
* The Aquarian Age (1984)
* The Next Millennium (1987)
* The 21st Century (1991)
* The Millennium Revolution (1993)
* The New Renaissance (1995)
* The Age of Enlightenment (1998)
* The Age of Reason (2001)
* The Age of Revolutions (2004)
* The Age of Empire (2006)
* The Age of Globalization (2009)
* The Age of Information (2011)
* The Age of Technology (2014)
* The Age of Science (2016)