Several murders of nuclear scientists, that baffles Scotland Yard, occur in London around the same time that Bill Locklin, a special officer from the United States State Department, arrives to oversee the transfer of Professor Leon Dushenko, a Russian scientist who has fled the USSR. An attempt on Dushenko's life is made with a monkey's paw-print found at the scene.

Richard Conte
as Bill Locklin

Rona Anderson
as Julia Jackson

Russell Napier
as Supt. John Harrington

Sylva Langová
as Hilde Heller, chief spy

Colin Gordon
as Harry Martin - reporter

Donald Bisset
as Editor Harris

John King-Kelly
as Spy Henchman

Bernard Rebel
as Vinson - Spy Henchman

Arnold Marlé
as Prof. Leon Dushenko

John Horsley
as Det. Sgt. Gibson
CinemaSerf
Richard Conte is the visiting American actor for this decent enough British-made thriller. He, "Locklin", is charged with ensuring the safe transfer of a defecting Soviet nuclear scientist "Dushenko" (Arnold Marlé). Simultaneously, a spate of murders is occurring in London and Scotland Yard (Russell...