The warden of the Adventure Centre, Charles Martin, is a weak man whose unfaithful wife, Bett, has driven him to drink. Bett is found dead in her husband's crashed Jaguar. It is assumed to be an accident or suicide, but further developments show that it is murder. Tough, middle-aged Miss Pink, one of the Centre's directors, proves herself to be a shrewd amateur detective. She realises that the Centre is being used as a cover for something very serious.