- _The Italian Connection_ (1988)
- _The Vatican Connection_ (1989)
- _The American Connection_ (1990)
- _The Chinese Connection_ (1991)
- _The Russian Connection_ (1992)
- _The Japanese Connection_ (1993)
- _The Arab Connection_ (1994)
- _The German Connection_ (1995)
- _The British Connection_ (1996)
- _The French Connection_ (1997)
- _The Spanish Connection_ (1998)
- _The Portuguese Connection_ (1999)
- _The Greek Connection_ (2000)
- _The Turkish Connection_ (2001)
- _The Egyptian Connection_ (2002)
- _The Israeli Connection_ (2003)
- _The Palestinian Connection_ (2004)
- _The Lebanese Connection_ (2005)
- _The Syrian Connection_ (2006)
- _The Iraqi Connection_ (2007)
- _The Iranian Connection_ (2008)
- _The Afghan Connection_ (2009)
- _The Pakistani Connection_ (2010)
- _The Indian Connection_ (2011)
- _The Bangladeshi Connection_ (2012)
- _The Nepalese Connection_ (2013)
- _The Bhutanese Connection_ (2014)
- _The Sri Lankan Connection_ (2015)
- _The Maldives Connection_ (2016)
Non-fiction
- _The Poison Diary: The Real Life of a Spy in the 21st Century_ (2011)
- _The Red Spy Queen: Her Life, Her Lies, Her Betrayal_ (2012)
- _The Man from Moscow: The Life and Lies of a KGB Colonel_ (2013)
- _The Defector: The Spy Who Turned Against Russia_ (2014)
- _The Spy Who Came In from the Cold: The True Story of Aldrich Ames_ (2015)
- _The Farewell Dossier: The Untold Story of the CIA's Secret War Against Russia_ (2016)
- _The Shadow Factory: The Ultra-Secret NSA Facility That Decrypted the World's Communications_ (2017)
- _The Mitrokhin Archive: The KGB's Secret Files_ (2018)
- _The Spymaster's Secrets: The Hidden Lives of the CIA's Directors_ (2019)
- _The Kremlin's Mole: The True Story of the KGB's Man in the White House_ (2020)