Chief Inspector Cromwell is spending a fishing vacation in Kent when one of the locals is found dead in the village pond after winning £ 200,000 in Sherwood's Treble Chance. The coroner's jury brings in a verdict of wilful murder and Ironsides, much to his disgust, is instructed to take charge of the investigation. But it isn't until after a second murder, that the whily Cromwell gets ready for the kill...