Note: There are other series with the same name: The Guardians (Danielle James), The Guardians (E. R. Paskey), The Guardians (Frank L. Cole), The Guardians (Lovegrove), The Guardians (Mandy M. Roth), The Guardians (Meljean Brook), The Guardians (Michael Kalb), The Guardians (Rebecca Rock), The Guardians (Samantha Long), The Guardians (T. F. Walsh)
- The Guardians (Saxon)
- 1 The Killing Bone (1969) by W. Howard Baker [only as by Peter Saxon]
- 2 Dark Ways to Death (1968) by W. Howard Baker and Wilfred McNeilly [only as by Peter Saxon]
- 3 The Haunting of Alan Mais (1969) by W. Howard Baker and Wilfred McNeilly [only as by Peter Saxon]
- 4 The Vampires of Finistere (1970) by Rex Dolphin [only as by Peter Saxon]
- Through the Dark Curtain (1968) by Ross Richards [only as by Peter Saxon]
- The Curse of Rathlaw (1968) by Martin Thomas [only as by Peter Saxon]