"Cain's Jawbone" is a murder mystery puzzle written by "Torquemada"-Edward Powys Mathers. 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.

Cain's Jawbone has been described as "one of the hardest and most beguiling word puzzles ever published. This club started this summer and has continuted on! So each Friday evening, we're hosting "Friday Night Murder Club" at Espressions. You'll find our 'crime board' as a part of the Potter Common Rooms in the back! Join us for a cup of coffee and a bite to eat as we move the pages around in this great mystery looking for the solution. Come when you can or come each Friday! We'll see you there.

It is not nessary, but if you'd like to get a copy of "Cain's Jawbone", we have a link below.