- 2010 _Farewell, My Lovely: Conversations with Margaret Millar_ (with Margaret Millar)
- 2005 _The Wrong Man_ (with Caryl Chessman)
- 1991 _Judge and Fool: Morton Sobell and the Novikon Affair_ (with Morton Sobell)
- 1979 _They Called Me Hood: The Autobiography of a Hollywood Agent_ (with William "Willie" Morris)
- 1971 _On Trial: The Case of Louis Beam, the Ku Klux Klan's Most Powerful Leader_
- 1971 _Murder of the Century: The Assassination of the Archduke_ (with Pierre Joffroy)
- 1969 _The Case for the UFO: Past and Present_ (with John A. Keel)
- 1967 _The New Face of War_ (with Malcolm Browne)
- 1965 _The Secret Road: The Story of the Underground Railroad_
- 1964 _The Miracle on the River Kwai_
- 1962 _All About Yves: Life Behind the Scenes with the Divine Miss G._ (with Yves Montand)
- 1958 _The Story of the United Nations: The First Ten Years_ (with Lester B. Pearson)
Fiction
- 2015 _The Deep End_
- 2012 _The Last King of Texas_
- 2009 _The Aquitaine Progression: A New Orleans Thriller_
- 1999 _The Persian Enigma: A Thriller of the Second World War_
- 1998 _The Lizard's Bite: A Thriller of International Intrigue_
- 1996 _No Such Agency_
- 1992 _The Silken Web: A Thriller of Political and Financial Intrigue on the Riviera_
- 1990 _An Affair of State: A Thriller_ (with Jeffrey Archer)
- 1989 _The Bonaparte Conspiracy_
- 1988 _The Shadow Cabinet: A Thriller_
- 1987 _The Cicero Spy Affair: A Novel of International Intrigue_
- 1985 _The List of Adrian Messenger_
- 1985 _The Stone Monkey: A Novel of Modern Espionage_
- 1983 _The Deep End_
- 1981 _The Nabob_
- 1977 _The Spell of the Gypsy Moth_
- 1975 _The Girl from Beijing_
- 1973 _The Aquitaine Progression_