The Conversation (Blu-ray)

Harry Caul (Gene Hackman) is an expert surveillance man in San Francisco. His routine wiretapping job turns into a nightmare when he hears something disturbing in his recording of a couple; he may have captured something a lot more important than adulterous goings-on. His investigation of the tape and how it might be used sends Harry spiralling into a web of secrecy, murder and paranoia.