They called it the manhunt of the century. Following a sensational murder in the heart of Belgravia that shocked high society and gripped the world, a new name was written into criminal folklore: Lord Lucan. In the 30 years since he vanished, numerous books and TV documentaries have theorized on his possible fate. Now former detective Duncan MacLaughlin—dubbed Scotland Yard"s top undercover cop—has tracked down the incredible truth.