I really enjoyed seeing Ella Raines;(the web 1947, the suspect & la dama desconicida a.k.a phantom lady 1944, The senator was indiscreet 1947 and of course impact 1949) in this British produced film from 1956; in fact she was my favourite American heroine actress.She died aged 68 of a lung type of cancer.This was my first viewing of this film courtesy of Youtube.com.Her personality seemed to be naturally heroic and hence she sparkled in this genre film.Russell Napier appeared in numerous British 'b' films in the 50s & early 60s playing Scotland Yard police inspectors and here makes another appearance as such.The lead actor, Derek Farr I know from "The Dambusters" (1954) Quiet Wedding (1940) & Quiet Weekend (1946).Karel Stepanek played his usual nasty character which was usually a Nazi as in "Sink the Bismark" (1960) or as here a Communist agent.Remember this was filmed before perestroika at the height of the cold war.
Another reviewer made a comparison of the lovely Ella Raines with the equally lovely Gene Tierney with which I concur.I certainly did not find the plot too talky and it had a nice balance between dialogue and action and I awarded it 7/10.