Director Francis Ford Coppola created this change of pace in between the first two Godfather movies. It's a suspenseful film about privacy, security, electronic snooping, and the paranoia that comes with all of that. It was relevant in the Watergate era (during which it was released), and it's possibly even more relevant today, with the exponential rise, since the movie was made, in the capabilities of technology. Enjoy it also, though, for the masterful leading performance by Gene Hackman as the tormented, secretive surveillance pro who learns more than he should've.
"Francis Ford Coppola's provoking mystery-thriller stars Gene Hackman as Harry Caul, an expert surveillance man. A routine wiretapping job turns into a nightmare when Harry hears something disturbing in his recording of a young couple in a park. His investigation of the tape and how it might be used sends Harry spiraling into a web of secrecy, murder and paranoia. Set against the backdrop of San Francisco, THE CONVERSATION is a harrowing psychological thriller that costars Cindy Williams, Frederic Forrest and Harrison Ford and symbolizes the uneasy line where technology and privacy cross."