If you revel in armchair criminal investigation, this book is just your cup of poisoned orange pekoe. Here are 15 old-fashioned 'detective puzzles', the unravelling of which requires well-honed powers of observation and deduction. In words, charts and diagrams, the authors put you at the crime scene and present you with the facts established by the police. Solving the questions that each case poses is your challenge. Answers at the back – if you must.