* The Relic
* The Gemini Candidate
* The Medusa Stone
* The Dragon Line
* The Crystal Mask
Non-fiction:
* Atlantis: The Mystery Solved
* The Great Pyramid: Decoding the Secrets of the Ancient World
* The Search for the Lost Ark of the Covenant
* The Holy Blood and the Holy Grail
* The Da Vinci Code: Cracking the Cryptic Clues