One of Coppola's very best. Harry Caul (Gene Hackman) is a professional surveillance expert, a wire-tapper and industrial spy for hire by anyone, as long as the price is right. Harry and his assistant Stan (Cazale) use state-of-the-art technical expertise to track a young couple, Ann (Cindy Williams)and Mark (Frederic Forrest), and record their conversations. The client is a mysterious and powerful businessman, known only as the "director" (Robert Duvall, in an unbilled cameo), whose motives are unclear. After listening to the tapes repeatedly, however, Harry deduces that Ann is the director's wife
and that she is having an affair with Mark, one of her husband's emp...