David Henderson
Albert Lieven
David Henderson

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...
David Henderson
Albert Lieven
David Henderson
Dr. Sheldon
Helmuth Rudolph
Dr. Sheldon
Katherine Walters
Ingeborg Körner
Katherine Walters
James Cooper
Michael Rittermann
James Cooper
Robin Caven
Sigurd Fitzek
Robin Caven
Det.-Inspect. Ford
Wolf Frees
Det.-Inspect. Ford
Det.-Sgt. Broderick
Heinz Klingenberg
Det.-Sgt. Broderick
Judy
Heidi Leupolt
Judy
Billie Reynolds
Marianne Wischmann
Billie Reynolds
Roger Ford
Andreas von der Meden
Roger Ford
Ralph Merson
Hans Zesch-Ballot
Ralph Merson
Mrs. Williams
Emmy Percy-Wüstenhagen
Mrs. Williams
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