The first volume in Vardeman's Keys to Paradisefantasy series was credited to the pseudonym "Daniel Moran", the publisher possibly being unaware of author Daniel Keys Moran, but the second book in that series then stated that Vardeman was "writing as Daniel Moran." Vardeman started publishing two other series under pseudonyms in the late 1980s – the fantasy series After the Spell Wars under the name F.J. Hale, and the Star Frontier science fiction series under the name of Edward S. Hudson. Both of these series were partially republished under Vardeman's own name. He also wrote Gateway to Doom from Tom Swift III, and The Microbots and Mutant Beach, part of the Tom Swift IVseries of books under the housepen name, Victor Appleton; as well as writing numerous westerns under the pen names Karl Lassiter and Jackson Lowry. He also wrote in the mid-1970s for Book Creations, Inc., under house pseudonymPaul Kenyon for The Baroness series, but the book was canceled before publication. Similar work includes eight novels written for the Nick Carter adventure series, the novelSea Fire under the name Cliff Garnett, more than 100 novels written for a major western series, plus eight novels written for another western series that was less enduring.
Works
He is the author of more than fifty fantasy and science fiction novels. An anthology of his short fiction, Stories From Desert Bob's Reptile Ranch, was published in 2007.
''Star Trek''
He wrote the original story novels Mutiny on the Enterprise focusing on Captain Kirk battling his own crew, and The Klingon Gambit, another official Star Trek novel.
Vardeman's fantasy series include The War of Powers, Cenotaph Road, Swords of Raemllyn, The Jade Demons, The Keys to Paradise trilogy, The Demon Crown trilogy, and a British-published trilogy called The Accursed. Vardeman also wrote the novelizations of the fantasy game series, God of War and ', a ' story. Vardeman's science fiction works include the Weapons of Chaos, Masters of Space and Biowarriors trilogies, and the stand-alone novels The Sandcats of Rhyl, Road to the Stars, and Ancient Heavens. The 1991 techno-thrillerDeath Fall is a related novel, although works set in a contemporary setting are often not categorized as science fiction.
Mysteries
Vardeman also wrote a series of three mystery novels involving the "psychic detective" Peter Thorne: The Screaming Knife, The Resonance of Blood and Death Channels.
Game tie-ins
Vardeman has written a number of game-related tie in works, including: