* The Ophelia Prophecy (2011)
* The Hades Effect (2012)
* The Stygian Gambit (2013)
* The Poseidon Deception (2014)
* The Zeus Conspiracy (2015)
* The Lost Book of the Grail (2016)
* The Book of Atlantis (2017)
* The Book of Secrets (2018)
* The Book of Shadows (2019)
* The Book of Fate (2020)
Nonfiction:
* The Complete Idiot's Guide to Greek Mythology (2007)
* The Complete Idiot's Guide to Norse Mythology (2008)
* The Complete Idiot's Guide to Egyptian Mythology (2010)
* The Complete Idiot's Guide to Arthurian Legends (2011)
* The Complete Idiot's Guide to Vampires (2012)
* The Complete Idiot's Guide to Angels and Demons (2013)
* The Complete Idiot's Guide to Ghosts and Hauntings (2014)
* The Complete Idiot's Guide to UFOs and Extraterrestrials (2015)
* The Complete Idiot's Guide to Superstitions (2016)
* The Complete Idiot's Guide to Urban Legends (2017)