On a February evening in 1785 Paris, an intermediary for Queen Marie Antoinette enters a famous jewelry shop to secure a diamond necklace for the royal: the most expensive in history. She has been sent on strict instructions to keep the transaction secret, lest the king find out. The intermediary leaves as quick as she came, with a promise that the queen will start sending payments come summertime. When she puts the necklace in her bag, it's the last the jewelers ever see of it, and payment never comes. This is the affair of the queen's stolen necklace.