Cain's Jawbone by Edward Powys Mathers

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.