Or you might conclude that the mystery-framers failed, in that the crime was not prevented. Gregory F. Treverton is the director of the RAND Corporation's Center for Global Risk and Security.

TEST your historical knowledge with this quiz that will put you through your paces. Can you remember what year Lord Lucan disappeared or how much money was stolen in The Great Train Robbery? This ...

But when a detective arrives to inspect the crime scene, they find no clues but ... ‘It’s a bit of a mystery why it was left here! Even stranger is that the thieves left a full can of petrol ...