- Title: Cain's Jawbone: A Novel Problem
- ISBN: 9781800180796
- Author: Edward Powys Mathers
- Genre: Thriller, Puzzles & quizzes, Puzzles & quizzes
- Category: Fiction
- Publisher: Boundless Publishing Group Ltd
- Binding: Paperback
- Language: English
The world's most fiendishly difficult literary puzzle
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