* The Witch's Child (1957)
*The Two of Us and the Swamp (1959)
*Journey to Nowhere (1960)
*The Magic Mirror (1962)
*Castles in the Sand (1963)
*The Mysterious Visitor (1965)
*The Black Door (1967)
*Time and Time Again (1968)
*The Secret Room (1970)
*The Shadow of a Doubt (1972)
*The Haunting of Cabin Green (1973)
*Stranger at Wildings (1975)
*The Mysterious Disappearance of Katie Boyd (1977)
*The Devil's Riddle (1979)
*The Witches of Wormingford (1981)
*The Legend of Sleepy Hollow (1983)
*Rip Van Winkle (1985)
*The Headless Horseman (1987)
*The Curse of the Mummy's Tomb (1989)
*The Phantom of the Opera (1991)
*The Hound of the Baskervilles (1993)
*The Time Machine (1995)
Nonfiction:
*The Mysterious World of the Unexplained (1968)
*The World of Witchcraft and Sorcery (1969)
*The World of Ghosts and Apparitions (1971)
*The World of Superstitions and Omens (1973)
*The World of Dreams and Delusions (1975)
*The World of UFOs and Extraterrestrials (1977)
*The World of Lost and Found Worlds (1979)
*The World of Ancient Mysteries (1981)
*The World of Natural Phenomena (1983)
*The World of Space and Time (1985)
*The World of the Human Mind (1987)
*The World of Science and Technology (1989)
*The World of Art and Literature (1991)
*The World of History and Social Studies (1993)
*The World of Sports and Recreation (1995)