Twenty-third entry in the long-running series featuring Chief Inspector Robert MacDonald of Scotland Yard. >Valehead House, standing so serenely in the sunshine among the rich Devonshire meadows, appealed to Mrs. Merrion from the moment she first glimpsed it. To her it was the happy ending to a wearisome home-hunting expedition and she arranged to move in with her father, Professor Crewdon. But her happiness, as often happens, was suddenly snatched from her by the tragic death of her father, whose body was found in a cave on the estate. Chief Inspector Macdonald of Scotland Yard was called in and was soon looking for motive, method and opportunity. Once again E. C. R. Lorac tells an absorbing and ingenious detective story.