I've only just heard about this book 'Cain's Jawbone: A Novel Problem' by The Observer's E P Mathers aka Torquemada. It was first published in 1934 but I think it's being re-released. and I was wondering if anyone had any information or first-hand knowledge about it.
Brendan, think it was re-released about a year ago, I read an interesting article this week in the Telegraph about it and a guy who solved it recently.