Most people overlooked the sullen deaf-mute teenager Francis Caux...until he led police to the scene of a murder. It was psychoanalyst and detective Mrs. Beatrice Lestrange Bradley who found a clever way to communicate with Francis, thus learning that his recent fear of water stemmed from a body chained to the underside of a boathouse dinghy. But how did Francis know the location of the body? Even more puzzling is the discovery of a second murder...