Cain's Jawbone

Cain's Jawbone
Front cover of Unbound edition
AuthorEdward Powys Mathers as "Torquemada"
LanguageEnglish
SubjectPuzzle book
PublisherVictor Gollancz Ltd (1934 edition)
Unbound (2019 edition)
Publication date
1934
Publication placeUnited Kingdom
Media typeHardback
Pages100
ISBN978-1783527410

Cain's Jawbone is a murder mystery puzzle written by Edward Powys Mathers under the pseudonym "Torquemada". The puzzle was first published in 1934 as part of The Torquemada Puzzle Book. In 2019, crowdfunding publisher Unbound published a new stand-alone edition of the puzzle in collaboration with the charity The Laurence Sterne Trust.

Both editions, when published, were accompanied by a competition which offered a cash prize to the first reader to solve the puzzle. Cain's Jawbone has been described as "one of the hardest and most beguiling word puzzles ever published."