* The Black Tower (1957)
* The Red Room (1958)
* The Ebony Tower (1959)
* The Ivory Tower (1960)
* The Crystal Tower (1961)
* The Rainbow Tower (1962)
* The Golden Tower (1963)
* The Silver Tower (1964)
* The Bronze Tower (1965)
* The Iron Tower (1966)
* The Stone Tower (1967)
* The Wooden Tower (1968)
* The Leather Tower (1969)
* The Cloth Tower (1970)
Short Stories:
* "The Devil's Tower" (1956)
* "The Ghost in the Tower" (1957)
* "The Mystery of the Tower" (1958)
* "The Prisoner in the Tower" (1959)
* "The Secret of the Tower" (1960)
* "The Treasure in the Tower" (1961)
* "The Curse of the Tower" (1962)
* "The Legacy of the Tower" (1963)
* "The Prophecy of the Tower" (1964)
* "The Vengeance of the Tower" (1965)
* "The War of the Tower" (1966)
* "The Peace of the Tower" (1967)
Non-Fiction:
* The History of the Tower of London (1968)
* The Architecture of the Tower of London (1969)
* The Legends of the Tower of London (1970)
* The Ghosts of the Tower of London (1971)
* The Prisoners of the Tower of London (1972)
* The Executions of the Tower of London (1973)
Children's Books:
* The Tower of London for Children (1974)
* The Ghosts of the Tower of London for Children (1975)
* The Prisoners of the Tower of London for Children (1976)
* The Executions of the Tower of London for Children (1977)