Elizabeth II's coronation is looming, but the murder of their wartime commander, Colonel Cartwright, spoils the happy mood for DI Edgar Stephens and magician Max Mephisto. A playbill featuring another deceased comrade is found in Colonel Cartwright's possession, and a playing card, the ace of hearts: the blood card. The wartime connection and the suggestion of magic are enough for him to put Stephens and Mephisto on the case. Edgar's investigation...