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 Napier) initially baffled, soon discovers that there is a connection and so he and "Locklin" have to work together to thwart the daring plot - starting with just a monkey's paw print for a clue! It's a bit formulaic this, there is a journalist (Colin Gordon) in on the search too; a kidnap and some g... read the rest.