| title | ISBN-13 | year of publication |
|---|---|---|
| A God for Lions: World Religions Simplified | 978-1-4033-5453-2 | 2003 |
| Murder in the Vatican: Pauper Who Would Be Pope | 978-1-4033-4806-7 | 2005 |
| Murder in the Vatican: The CIA and the Bolshevik Pontiff | 978-1-4490-2304-1 | 2010 |
| Murder In The Vatican: The Revolutionary Life Of John Paul And The CIA, Opus Dei And The 1978 Murders | 978-1-4343-8722-6 | 2008 |
| Murder in the Vatican: The Revolutionary Life of John Paul and The CIA, Opus Dei and the 1978 Murders | 978-1-4343-8723-3 | 2008 |
| Murder in the Vatican: The Revolutionary Life of John Paul and the Vatican Murders of 1978 | 978-1-4259-5308-9 | 2006 |
| Murder in the Vatican: The Revolutionary Life of John Paul and The Vatican Murders of 1978 | 978-1-4259-5309-6 | 2006 |
| White Light, Dark Night: The Revolutionary Life of John Paul I | 978-1-4343-0692-0 | 2007 |