Grandmother Agatha did not have a sense of humor during her lifetime, but after her death she joked about her grandchildren in such a way that their whole lives were turned upside down. She forced her granddaughter Caroline Kamp, a writer of detective novels, to investigate the crime. And his grandson, Miles Kamp, a literary critic, to write a good detective story. Only on these conditions can young people receive an inheritance. But neither Miles nor Caroline yet know how far Grandma Agatha’s joke will take them...