Journalist Ryota Ishiguro's body is found on the riverbank, but although the cause of his death is drowning, the body is dry. Reiko's investigations lead her to Shiho and Satoshi Kambara, a loving couple from whom Ishiguro had been demanding money, but they claim to have an alibi. The discovery of a silver spoon with the engraving "Shiho to Leo" takes the case in an unexpected direction.