The classic New York Times–bestselling tale of suspense and intrigue that takes readers behind the scenes of the secretive billion-dollar diamond business From a centuries-old building on a narrow street in the heart of London, a firm known as the System, the world's most lucrative and least-known cartel, maintains a stranglehold on the world's diamonds. The company selects the stones a customer can buy and decides how much he must pay for the privilege. One dealer is tired of the game, and so he sets out to destroy the System forever. With the help of his mistress, Chesser sketches a plan to infiltrate the offices at 11 Harrowhouse—and make off with every diamond the System owns. But this billion-dollar heist is not as simple as it seems, for the System is always watching.