Checkmate has more than one mystery to solve when they are hired by an unknown client to protect an unknown victim from an unknown killer at Felicia Royden's remote estate. Jed and Dr. Hyatt, posing as servants for the family, are puzzled by Mrs. Royden's strange little girl, Carol, who apparently makes up wild stories for no reason, but they soon begin to think Carol may hold the key to the mystery.
—SweetBetsy