Twelve unexplained phenomena with no apparent earthly explanation, including a dog-shaped gunpowder mark; an omen from the "other side"; a haunted house; a chilling seance; an elderly lady's hold over a young man; and a mysterious SOS. Contents S.O.S. • (1926) • short story by Agatha Christie The Call of Wings • (1933) • short story by Agatha Christie The Fourth Man • (1933) • short story by Agatha Christie The Gipsy • (1933) • short story by Agatha Christie The Hound of Death • (1933) • short story by Agatha Christie The Lamp • (1933) • short story by Agatha Christie The Last Séance • (1926) • short story by Agatha Christie The Mystery of the Blue Jar • (1924) • short story by Agatha Christie The Red Signal • (1924) • short story by Agatha Christie The Strange Case of Sir Arthur Carmichael • (1933) • short story by Agatha Christie The Witness for the Prosecution • non-genre • (1924) • novelette by Agatha Christie Wireless • (1926) • short story by Agatha Christie