A day at the races for Detective Inspector Tremayne, idyllic at the outset, soon changes. A horse is dead, and then the owner's daughter is found murdered, and Tremayne's there when the body is discovered. The question is, was Tremayne set up, in the wrong place at the right time? He's the cast-iron alibi for one of the suspects, and he knows that one murder leads to two, and more often than not, to three. The dead...