" Put it in terms of the not-too-serious, if you like. Who got into that locked room? And how was it done? And why should the cup have been moved again? We're up against the essential detective problems of who, how, and why. Simply because there was no murder or near-murder, does that make the mystery one bit less baffling? "

― , The Cavalier's Cup (Sir Henry Merrivale, #22)