"Impenetrable. Well protected. Secure. Home to the most valuable jewels on earth. But once a year, when the Queen attends the State Opening of Parliament, the Metropolitan Police must execute the most secret operation in their armory as they transport the Crown Jewels across London. For decades, the elite squad at Scotland Yard have been in charge of the operation. And for decades, it's run like clockwork. But this year, everything is about to change....