Novels[]
- 1971 – The Invisibles
- 1973 – The Mind Master
- 1977 – Kingdom of the Spiders
- 1979 – By Blood Alone
- 1980 – My Savage Muse: The Story of My Life by Edgar Allan Poe
Anthologies[]
- 1965 – Monsters Galore
- 1966 – Strange Lives
- 1966 – Strange Tales
- 1967 – Monsters and Nightmares
- 1967 – Strange Talents
- 1967 – Vampires, Werewolves & Other Demons
- 1968 – The First Occult Review Reader
- 1969 – The Second Occult Review Reader
- 1971 – Ghosts, Ghouls, and Other Horrors
- 1972 – Passport to the Supernatural: An Occult Compendium from All Ages and Many Lands
- 1973 – Eerie Tales of Terror & Dread
- 1975 – Strange Curses
- 1981 – Vampires
Collections[]
- 1973 – Chilling Ghost Stories
- 1978 – Haunted Houses
Short Stories[]
- 1973 – The House That Didn't Want Anyone to Live In It
- 1973 – What the Gravedigger Saw
- 1973 – The Pirate Ghost of Gombi Isle
- 1973 – The Midnight Ghost
- 1973 – The Haunted Clock
- 1973 – A-Ling and the Evil Spirits
- 1973 – The Magician
- 1973 – The Thing
- 1973 – The Woman in Green Velvet
- 1973 – The Phantom's Gold
- 1973 – Riding a Tombstone
- 1973 – The Headless Princess
- 1973 – The Woman Who Climbed From Her Grave
- 1973 – The Banshee Whose Feelings Were Hurt
- 1973 – The Ghost Who Helped a Ghost
- 1973 – The Poltergeist with the Heart of a Genie
- 1978 – The Legend of the Screaming Skulls
- 1978 – The Lady in the Closet
- 1978 – Silky
- 1978 – The Phantom of Jedburgh Castle
- 1978 – The Ghosts of the Boleyns
- 1978 – The Mystery House of Horror
- 1978 – The Phantom Redhead of the Old Parish Jail
- 1978 – The Ghost with the Missing Shoe
- 1978 – The MacKenzie Ghosts
- 1978 – The House of the Lonely Ghosts
- 1978 – The Room of the Murderous Phantoms
- 1978 – The Invasion of the Fox Spirits
- 1978 – Horror by the Sea
- 1978 – The Coffin in the Empty Room
- 1978 – The Tragic Ghost of Cambridge University
- 1978 – The Noisy Ghost of Barbey
- 1978 – The House with the Living Ghost
- 1978 – The Little Weeping Ghost
- 1978 – The Unsolved Mystery
- 1978 – The Screaming Skull of Belliscombe House
- 1978 – The Ghostly Party
- 1978 – The Curse of Mouse Tower
- 1978 – The Ghostly Beautician
- 1978 – The Cold Dead Hand
- 1978 – The Ghost of Powis Castle
- 1978 – The Four-Legged Ghosts of Ballechin House
- 1978 – A Blood-drinking Ghost
- 1978 – The Girl with the Beckoning Eyes
Non-Fiction[]
- 1963 – Terror By Night
- 1969 – The Monstrous Undead
- 1976 – The Vampire Papers
- 1993 – Supernatural Wonder from Around the World