- Series: Randy Knowles, Psychic Detective Series Record # 28729
- Series Tags: paranormal mystery (3)
- Randy Knowles, Psychic Detective
- 1 The Alchemy Deception (1973) by Hans Holzer
- 2 The Habsburg Curse (1973) by Hans Holzer
- 3 Psychic Detective: The Unicorn (1976) by Hans Holzer