Puck and Eje have been married for two months when they decide to spend the last weeks of their holiday in Einar's idyllic childhood town of Skoga. Puck's father Johannes Ekstedt, professor of Egyptology, has a cat named Thotmes III that joins the couple. They borrow Einar's sister's beautiful old wooden house as well as her highly competent housekeeper. But after the first night, the idyll crumbles when Einar finds a dead body on the lawn, a young man stabbed to death with a dagger. Christer Wijk enters the stage and, with the help of Puck's observations, the mystery approaches its tragic solution.