A legendary literary puzzle by Torquemada. First published in 1934, Cain's Jawbone is considered one of the most challenging mysteries ever created. The book consists of 100 pages presented in the wrong order, and the reader's task is to determine the correct sequence of pages and identify the six murder victims and their killers.

Combining wordplay, literary references, cryptic clues, and intricate puzzles, the book has gained cult status among mystery enthusiasts and puzzle solvers. For decades, only a handful of people successfully solved the entire puzzle, making it one of the most difficult literary challenges ever published.