I don't give that many 5 stars but this 1951 Rank film directed by Roy Boulting deserves them. Fast paced and still perhaps strangely topical, the film tells how the Police and Secret Service Agencies foil a "Communist" plot to destroy Battersea Power Staion. Well cast with actors in roles unusual for most of them-Liam Redmond top billed as the Policeman in charge, Kenneth Griffith as a reluctant conspirator, Mary Morris, Joan Hickson in one of her best straight roles, and, I even saw Marianne Stone!! The plot and tension never really lets up and the climax is cleverly filmed. All in all 90' of pleasure. An excellent B/W 4.3 Print, and a fair price all help. Highly recomended.