* The Body Farm (1994)
* Nightwork (1996)
* Glass House (1998)
* The Holy Terror (2001)
* Coup de Grace (2004)
* The Dying Place (2006)
* Death at the Vatican (2009)
* Dante's Inferno (2011)
* The Devil's Playground (2013)
* Ave Maria (2015)
* Purgatorio (2017)
* Paradiso (2019)
Non-fiction:
* In Pursuit of the Holy Shroud (2010)
* The Jesuit (2012)
* The Templars (2014)