The Conversation (1974)

Francis Ford Coppola turns the mechanics of wiretapping inward, transforming directional microphones and reel-to-reel magnetic tape into instruments of psychological disintegration. Gene Hackman gives a career-best performance as Harry Caul, a detached audio surveillance expert whose professional aloofness unravels as he obsessively filters a recorded murder conspiracy. In an age of ubiquitous digital listening devices, Caul tearing his own flat apart in search of a bug remains the definitive portrait of technological paranoia.