Impenetrable. Well protected. Secure. Home to the most valuable jewels on earth. But once a year, the Metropolitan Police must execute the most secret operation in their armoury when they transport the Crown Jewels across London. For four years, Chief Superindendent William Warwick -- together with his second-in-command Inspector Ross Hogan -- has been in charge of the operation. And for four years it's run like clockwork. But this year, everything is about to change. Because master criminal Miles Faulkner has set his heart on pulling off the most outrageous theft in history -- and with a man on the inside, the odds are in his favour. Unless Warwick and Hogan can stop him before it's too late...