* "Squire" (1993)
* "Lie Back and Think of England" (1995)
* "The Disappearance" (1997)
* "The Heretic" (1999)
* "The Secret of Manannán Mac Lir" (2002)
* "The Forbidden Zone" (2004)
* "Bloodlines" (2006)
* "The Seventh Prophecy" (2008)
* "The Eighth Day" (2010)
* "The Ninth Circle" (2012)
* "The Tenth Commandment" (2014)
* "The Devil's Triangle" (2016)
* "The Bermuda Triangle" (2018)
Short stories:
* "The Last Days of the World"
* "The Lost City of Atlantis"
* "The Secret of the Holy Grail"
* "The Search for El Dorado"
* "The Mystery of the Loch Ness Monster"
* "The Roswell UFO Incident"
* "The Tunguska Event"
* "The Dyatlov Pass Incident"
* "The Philadelphia Experiment"
* "The Montauk Project"