Jack O'Judgment is a 1920 thriller novel by the British writer Edgar Wallace. It features a vigilante who takes action against a gang of blackmailers, using a mysterious identity and leaving the Jack of Clubs as a calling card.[1]

References

  1. ^ Clark, Neil (2015). Stranger than Fiction: The Life of Edgar Wallace, the Man Who Created King Kong. Stroud, UK: The History Press. p. 159. ISBN 0752498827.