* The Last Mirror (1980)
* The Edge of Forever (1981)
* Beyond the Threshold (1983)
* The Timemaster (1984)
* The Eye of Ra (1985)
* The Secret of Shambala (1986)
* The Return of Merlin (1987)
* The Last Atlantis (1988)
* The Secret of the Templars (1989)
* The Enigma of the Maya (1990)
* The Power of the Pyramids (1991)
* The Legacy of the Sphinx (1992)
* The Mysteries of Easter Island (1993)
* The Legend of the Loch Ness Monster (1994)
* The Secret of Stonehenge (1995)
* The Bermuda Triangle (1996)
* The Abominable Snowman (1997)
* The Lost City of Atlantis (1998)
* The Roswell UFO Crash (1999)
* The Philadelphia Experiment (2000)
* The Tunguska Explosion (2001)
* The Crop Circles (2002)
* The Big Bang (2003)
* The Black Hole (2004)
* The Multiverse (2005)
* The Origin of Life (2006)
* The Future of Humanity (2007)
Non-fiction:
* Beyond the Limits (1982)
* The Search for Truth (1993)
* The Mysteries of the Universe (1994)
* The Nature of Reality (1995)
* The Science of Consciousness (1996)
* The Power of the Mind (1997)
* The Healing Power of Energy (1998)
* The Secret of Life (1999)
* The Future of Evolution (2000)
* The Meaning of Existence (2001)
* The Nature of God (2002)
* The Power of Love (2003)
* The Quest for Happiness (2004)
* The Path to Enlightenment (2005)
* The Wisdom of the Ages (2006)
* The Mysteries of the World (2007)