Suster's father was Ilya Suster, an entrepreneur in the egg products industry, who was born Ilya Shusterovich in Harbin, Manchuria on October 17, 1914), grew up in Hamburg, Germany, and emigrated with his family to the United Kingdom in 1939. Gerald Suster was married twice, in 1975 to Ann Nash (marriage dissolved) and in 1992 to Michaela Antonina Duncan (1948-2001).

Fiction

• The Devil's Maze (1979)
• The Elect (1980)
• Hitler and the Age of Horus (1981)
• The Scar (1981)
• The Offering (1982)
• The Block (1983)
• Stryker (1984)
• The Force (1984)
• The Handyman (1985)
• The God Game (1986)
• The Labyrinth of Satan (1997)

Non-fiction

• Hitler: The Occult Messiah (1981)
• The Legacy of the Beast: The Life, Work, and Influence of Aleister Crowley (1988)
• John Dee: Essential Readings (1986)
• Hitler, Black Magician (1987)
• Crowley's Apprentice: The Life and Ideas of Israel Regardie (1989)
• The Truth About the Tarot: A Manual of Practice and Theory (1996)
• The Hell-Fire Friars: Sex, Politics & Religion (2000)