The Mystery of the Coughing Dragon (1970) - Front cover of ''The Mystery of the Coughing Dragon''.The Mystery of the Coughing Dragon (1970) - Illustration from ''The Mystery of the Coughing Dragon'' by artist Harry Kane.The Mystery of the Talking Skull (1969) - Front cover of ''The Mystery of the Talking Skull''.The Mystery of the Magic Circle (1978) - Front cover of ''The Mystery of the Magic Circle''.The Mystery of the Silver Spider (1967) - Front cover of ''The Mystery of the Silver Spider''.The Secret of Terror Castle (1964) - Front cover of ''The Secret of Terror Castle''.The Mystery of the Shrinking House (1972) - Front cover of ''The Mystery of the Shrinking House''.Alfred Hitchcock: The Three Investigators - Front cover from the ''The Three Investigators'' series.The Mystery of the Dancing Devil (1976) - Front cover of ''The Mystery of the Dancing Devil''.The Secret of Skeleton Island (1966) - Front cover of ''The Secret of Skeleton Island''.The Secret of Shark Reef (1979) - Front cover of ''The Secret of Shark Reef''.The Secret of the Phantom Lake (1973) - Front cover of ''The Secret of the Phantom Lake''.The Mystery of the Vanishing Treasure (1966) - Front cover of ''The Mystery of the Vanishing Treasure''.The Secret of the Crooked Cat (1970) - Front cover of ''The Secret of the Crooked Cat''.The Secret of the Haunted Mirror (1974) - Front cover of ''The Secret of the Haunted Mirror''.