An attempt to see with one's own eyes a naiad - a river nymph - which was rumored to have been seen in the vicinity of Winchester, turned out for Miss Carmody, her young niece Connie and relatives - the Tidson couple - evidence of the brutal murder of a boy whose body was fished out of a stream Mr. Tidson assures everyone that the boy was probably drowned by a naiad, but Miss Carmody begins to suspect Tidson himself of this crime. What reasons could she have for this? And after a while, the body of another teenager is found... The police are at a loss, but Mrs. Bradley will come to their aid. In the beloved boat of the beautiful, like a Greek god, but, unfortunately, deaf-mute young man Francis Cox, the corpse of a man who traded in blackmail is found tied to the bottom . And soon another mysterious murder occurs, but on the estate where Sir Adrian, Francis’ grandfather and a passionate athlete, gathered players to participate in a cricket match. Are these crimes related? And do Francis, his twin brother Derek and Sir Adrian himself have anything to do with them? Mrs. Bradley has to figure it all out.