In London, the Italian gym teacher Enrico ‘Henry’ Rosseni is having a love affair with his eighteen year-old student Elizabeth Seccles, who is the daughter of the owner of the Catholic school where he works and she studies. His estranged wife, Herta Rosseni’s the mathematics teacher. Rosseni and Elizabeth are in a boat in a grove when the girl sees a man hunting down a woman. Rosseni believes she’s making it up, but the next morning, Rosseni learns a teenager was murdered; in the river bank in the grove. Inspector Barth goes to the school since the victim Hilda studied there and soon, Rosseni’s the prime suspect, though Elizabeth could give an him an alibi. When a second student’s murdered, and then so is Elizabeth. Rosseni decides to investigate, and teams up with Herta to find the of the mysterious Solange Beauregard, but what might have happened to Solange?