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.
A routine wire-tapping job turns into a modern nightmare as Harry, a surveillance expert, hears something disturbing in his recording of a young couple in the park.