- "America's War on Drugs" (2019)
- "Skjult Hitler" (2012)
- "The Boys of '33:FDR's First White House Secret Service Detail" (2008)
- "I Guds navn" (2006)
- "Operation Thunderbolt" (2005)
- "The Brotherhood" (2004)
- "Den tredje mand:John Carradines liv i film" (2003)
- "Manden bag myten:En undersøgelse af mysteriet omkring Dr. Death" (2001)
- "Den første jødiske detektiv" (1998)
- "Jackpot:The 5-Million-Dollar Lottery Murder" (1996)
- "Hitler's Last Days:The Plot to Save Hitler" (1994)
- "The JFK Myth" (1993)
- "Hvem dræbte JFK?" (1992)
Skønlitterære bøger:
- "The Berlin Conspiracy" (2015)
- "Killing Hitler" (2013)
- "Hitlers sidste plot:The Dark Tale of SS-oberst Otto Skorzeny" (2011)
- "The Shadow War:The Secret Wars of Osama Bin Laden, Yasser Arafat, and Saddam Hussein" (2009)
- "Drengene i hulen" (2007)
- "The Death Artist" (2002)