* The Sky Below (1974)
* Glass Houses (1975)
* Talking to the Stones (1977)
* Travels in the Looking-Glass: Three Novellas (1978)
* Mirrored (1979)
* The Woman in Red (1981)
* The Circle (1982)
* Out of Nowhere (1983)
* The Flight of the Swan (1985)
* Shadow of the Wolf (1987)
* Daughters of Light (1989)
* Dark Lady (1990)
* Black Wine (1992)
* Serpent's Tooth (1993)
* Dragon's Bait (1995)
* Death's Daughter (1996)
* The Darkest Hour (1997)
* The Night of the Fire (1999)
* The Ghost in the Mirror (2001)
* The Lost Treasure of the Incas (2002)
* The Curse of the Jade Scorpion (2003)
* The Secret of the Mayan Crystal (2004)
* The Riddle of the Sphinx (2005)
* The Code of the Templars (2006)
* The Prophecy of the Mayan Elders (2007)
* The Last Secret of the Inca (2008)
* The Daughter of the Red Emperor (2009)
* The Curse of the Monkey God (2010)
* The Tomb of the Golden King (2011)
* The Secret of the Lost City (2012)
* The Curse of the Pharaoh's Tomb (2013)
* The Enigma of the Crystal Skulls (2014)
* The Legacy of the Knights Templar (2015)
* The Order of the Black Sun (2016)
* The Circle of the Sun (2017)
* The Secret of the Golden Flower (2018)
* The Power of the Pyramids (2019)
* The Mystery of the Bermuda Triangle (2020)
* The Legend of the Yeti (2021)
* The Curse of the Voodoo Queen (2022)
Non-fiction
* The Making of a Writer (1980)
* Writing as Self-Discovery: A Creative Writing Manual (1983)
* From Writer to Writer (1988)
* The Writers' Guide to Making a Living from Your Writing (1994)
* The Art of Writing: A Guide for the 21st Century (2001)
* The Business of Writing: A Guide to Publishing and Promoting Your Work (2004)
* The Craft of Writing: A Creative Writing Manual (2007)
* The Art of Novel Writing: A Guide to Writing and Publishing Your Novel (2010)
* The Business of Writing for Children and Young Adults: A Guide to Publishing and Promoting Your Work (2013)
* The Craft of Writing for Children and Young Adults: A Creative Writing Manual (2016)