Years ago, a murder was committed on the night of a costume party thrown by Sir Richard Haydon. Sir Richard's estate contained the grove of Astarte, which held a mysterious stone summer house rumored to have been the site of numerous sacred rites in years long past. As a surprise, the lovely Diana Ashley enacted the role of Astarte. It startled Sir Richard who stumbled and fell. When the others reached him, he was found dead of a knife wound to the heart.

Dr. Pender sets out the details. After all these years, can the Tuesday Night Club still solve the case?