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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....

When the Daily Mirror called The Chalon Heads "one of the best-crafted, best-plotted, and most convincing British thrillers for decades," you knew it had to be good. David Brock and Kathy Kolla are summoned to Cabot's, a venerable dealer in rare stamps on the Strand, and at first they expect a simple case of theft and a pleasant digression from the usual sort of murderous wrongdoing they encounter in the Serious Crime Branch of Scotland Yard. But...