Cain's Jawbone

Illustrated by Tom Gauld, acclaimed cartoonist and author of Goliath.
A famously difficult puzzle novel from the Observer's legendary crossword composer.
The prize of GBP1,000 for the first reader to solve the puzzle within a year of publication was awarded to the actor and comedy writer John Finnemore. Finnemore's win was covered by the Guardian, the Telegraph and the London Review of Books among others.
The project was supported by Neil Gaiman and re-issued with help from the Laurence Sterne Trust.

For fans of Alex Bellos, the Guardian's puzzles, the Today programme's Puzzle for Today.