A serial killer named The Shark is terrorizing London by killing his victims with a speargun and then, dressed in a scruba-diver's wetsuit, using the city's sewer tunnels to make his getaway.

Joachim Fuchsberger
as Inspektor Ward

Brigitte Grothum
as Leila Smith

Elisabeth Flickenschildt
as Nelly Oaks

Klaus Kinski
as Gregor Gubanow

Eddi Arent
as Barnaby

Richard Münch
as Dr. Collins

Jan Hendriks
as Roger Lane

Heinz Engelmann
as Mr. Broen

Siegfried Schürenberg
as Sir John

Hela Gruel
as Anna Smith