
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...

Albert Lieven
David Henderson
Helmuth Rudolph
Dr. Sheldon

Ingeborg Körner
Katherine Walters
Michael Rittermann
James Cooper
Sigurd Fitzek
Robin Caven
Wolf Frees
Det.-Inspect. Ford
Heinz Klingenberg
Det.-Sgt. Broderick
Heidi Leupolt
Judy
Marianne Wischmann
Billie Reynolds
Andreas von der Meden
Roger Ford

Hans Zesch-Ballot
Ralph Merson
Emmy Percy-Wüstenhagen
Mrs. Williams
Willy Witte
Detective Morris

Werner Schumacher
Polizist Sanders
Jochen Rathmann
Chris Reynolds
Esther Queil
Maria Rocello

Manfred Inger
Harry Vincent
Joachim Hoene
Ended