About the book: 1892 / Mr. Holder, the head of the second most important banking firm in London, gave one extremely high-ranking person a large sum as collateral for a couple of days. The collateral was a priceless beryl diadem - the property of the nation. Fearing leaving such value in the bank, Holder took it to his home. But on the very first night one of the teeth of the diadem disappeared...