Why is Ruth van Rydock worried about her sister To reassure her old friend, Miss Marple agrees to go down to Stonygates, the rambling country mansion where Carrie-Louise lives with her third husband, Lewis Serrocold. There she finds herself in the midst of a bizarre m?nage an extended family and a reformatory for young criminals where violence seems just below the surface. Shots are fired in a darkened room, but the victim is discovered elsewhere. Miss Marple soon deduces the identity of the killer but not how it was done. Then she discovers Inspector Slack's secret hobby.