This is a fiendish collection of riddles, mysteries and puzzles to test and tease your brain. Separated into original brainteasers and timeless conundrums, plus locked-room head-scratchers and unsolvable crimes borrowed from the very best of detective fiction, this collection will give your lateral thinking muscle a proper workout. See if you can crack the problems by tracing the clues tucked away in each mystery, without sneaking a peak at the answers at the back of the book.