* *Helsingfors' (1952)
* *Journey in the Dark' (1955)
* *The Voyage of the Damned' (1971)
* *The Last Voyage of the Almirante' (1980)
* *The Devil’s Marchioness' (1986)
Nonfiction
* *Men of Valour' (1942)
* *By Land, Air and Sea' (1946)
* *An Affair of Honour: Moscow, June 1612' (1948)
* *The Savage Years: a History of the First Five Years of the Third World War' (1954)
* *White Cargo: The History of the White Slave Trade in Black Africa' (1968)
* *Double, Double, Toil and Trouble: a History of the Black Magic Arts from Antiquity to the Present' (1971)
* *The Rape of Christianity: the Dispatches of T. L. Constant: 1840–1841' (1973)
* *Dracula: a Biography' (1973)
* *Bloody Murder: the Real Dracula's History and Adventures' (1976)
* *Hitler versus Russia: the Eastern Front, 1941-1945' (1978)
* *The Last Secrets of the Temple: the Mystery of Rennes-le-Château and the Priory of Sion' (1981)
* *Prince Philip: the First Biography' (1991)
* *The White Road to the Temple: a Study in the Legends and Teachings of the Knights Templars' (1995)