
Italian frogman and scientist Paolo Rocello is found dead on a houseboat. The owner of the boat, Mr. Cooper, has disappeared without a trace. The English boarding school town of Medlow is now in turmoil. Of all people, the likeable boarding school teacher David Henderson is increasingly suspected of murder. This is because Katherine Walter, the niece of Dr. Sheldon, saw him on the boat on the day of the murder. However, Dr. Sheldon himself also becomes a suspect. Inspector Ford and Sergeant Broderick are in the dark – until another murder occurs and a completely new perspective on the events emerges...

as David Henderson

as Dr. Sheldon

as Katherine Walters

as James Cooper

as Robin Caven

as Det.-Inspect. Ford

as Det.-Sgt. Broderick

as Judy

as Billie Reynolds

as Roger Ford

as Ralph Merson

as Mrs. Williams

as Detective Morris

as Polizist Sanders

as Chris Reynolds

as Maria Rocello

as Harry Vincent