An A To Z of Ancient Egypt

2006

An A to Z of Atlantis

2006

An A to Z of King Arthur and the Holy Grail

2007

An A to Z of the Occult

2007

Cracking the Da Vinci Code

The Unauthorized Guide to the Facts Behind Dan Brown's Bestselling Novel

2004

Decoding The Lost Symbol

The Unauthorized Expert Guide to the Facts Behind the Fiction

2006

Economics

2006

Illuminating Angels & Demons

2004

The Dan Brown Companion

2006

The Reykjavik Confessions

The Incredible True Story of Iceland's Most Notorious Murder Case

2018