In the noisy London Underground, a man falls under a train’s wheels. A banal accident? Perhaps… In an old English castle, a regular tourist is murdered under mysterious circumstances. Nonsense, absurdity? Maybe… Could the two such different deaths somehow be connected? Could it be the work of a cynical, calculating—down to genius—crime rooted in another crime committed many years ago? This is a mystery that must be solved—its only key is the UNKNOWN MAN IN A BROWN SUIT…