* Night's Black Angels (1960)
* Red Moon Rising (1963)
* Man of Ice (1964)
* The Final Affair (1966)
* The Manipulators (1968)
* A Surfeit of Guns (1969)
* A Rose for the Dead (1971)
* The Last Candidate (1972)
* The Vengeance Man (1974)
* The Judas Contract (1975)
* The Doomsday Target (1977)
* The Last Testament (1979)
* The Death Train (1981)
* The Devil's Command (1982)
* The Kremlin Conspiracy (1984)
* The Black Tower (1986)
* The Ark of Doom (1987)
* The Judas Factor (1989)
* The Armageddon Agenda (1991)
* The Apocalypse Alliance (1993)
* The Resurrection Factor (1994)
* The Doomsday Covenant (1996)
* The Satan Syndrome (1998)
* The Fury (2001)
* The Vengeance Trail (2002)
* The Hades Agenda (2004)
* The Armageddon Covenant (2006)
* The Lucifer Covenant (2007)
* The Omega Conspiracy (2011)
* The Doomsday Order (2012)
* The Annihilation Protocol (2013)
* The Orion Ultimatum (2014)
* The Hades Prophecy (2015)
* The Armageddon Code (2017)
* The Doomsday Equation (2019)
Collections
* The Satan Dossier (1976)
* The Devil's Guard (1983)
* The Devil's Strike Force (1990)
* The Devil's Alliance (2003)
* The Armageddon Command (2009)