Here we have twelve interesting but unexplained phenomena with no apparent earthly explanation. Including a dog-shaped gunpowder mark, an omen from the other side, a haunted house, a chilling séance, an elderly lady's hold over a young man, and a mysterious SOS.

The stories are: 1. The Hound of Death (1933), 2. The Red Signal (1924), 3. The Fourth Man (1933), 4. The Gipsy (1933), 5. The Lamp (1933), 6. Wireless, (1926), 7. The Witness for the Prosecution (1924), 8. The Mystery of the Blue Jar (1924), 9. The Strange Case of Sir Arthur Carmichael (1933), 10. The Call of Wings (1933), 11. The Last Séance (1926), and 12. S.O.S. (1926).

Librarian's note: this is the entry for the collection of 12 short stories. Individual entries with characters, settings and other details can be found for each specific title, including the title story, elsewhere on GR and reviews of each can be done at those locations.