Cressida Fawcett’s stay at Ayrton Castle in the Scottish Highlands is interrupted by the murder of Hamish Glenkirk, the castle’s former owner, found dead in a locked turret room. With Detective Andrews delayed, Cressida takes on the case, scrutinizing the hunting party for suspects. The mystery deepens with another murder, prompting Cressida to navigate through castle secrets and possible motives, using her sharp wit to identify the killer before another victim falls.