* Saken om den avskyelige snømannen (1959)
* Case of the Deadly Parrot (1961)
* The Case of the Drowning Boy (1963)
* The Case of the Hidden Riches (1964)
* The Case of the Laughing Dwarf (1966)
* The Case of the Sinister Spell (1968)
* The Case of the Talking Skull (1969)
* The Case of the Vanishing Clue (1970)
* The Case of the Weeping Idol (1972)
* The Case of the X-Ray Eyes (1973)
* The Case of the Mad Magician (1975)
* The Case of the Monster in the Closet (1977)
* The Case of the Robot Invasion (1978)
* The Case of the Supercrook (1979)
* The Case of the Time Machine (1981)
* The Case of the Space Station (1982)
* The Case of the Alien Encounter (1984)
* The Case of the Titanic Treasure (1986)
* The Case of the Trojan Horse (1988)
* The Case of the Loch Ness Monster (1991)
Noveller
* "The Case of the Missing Moustache" (1962)
* "The Case of the Talking Dog" (1963)
* "The Case of the Mysterious Mummy" (1964)
* "The Case of the Haunted House" (1965)
* "The Case of the Phantom Thief" (1967)
* "The Case of the Robot Revolution" (1971)
* "The Case of the Incredible Shrinking Man" (1976)
* "The Case of the Invisible Man" (1980)
* "The Case of the Teleportation Machine" (1985)
* "The Case of the Bermuda Triangle" (1989)
Andre arbeider
* The Encyclopedia of Sherlock Holmes (1974)
* The Secret Life of Sherlock Holmes (1975)
* The Great Detectives (1977)
* The Mystery Novel:A Critical History (1978)
* The Detective Story:A Collection of Critical Essays (1980)
* The Art of the Mystery Story (1982)
* The Modern Mystery Novel:A Critical History (1985)
* The Complete Sherlock Holmes (1986)