When his old friend, the laboratory engineer Tom Gruneman (Robert Milli) vanishes, detective John Klute (Donald Sutherland) is hired by Tom’s colleague Peter Cable (Charles Cioffi) to search for him. The unique lead is an obscene letter allegedly written by Tom to a call-girl in New York called Bree Daniels (Jane Fonda), and Klute moves to the Big Apple to investigate the disappearance of Tom. Klute blackmails Bree to help him to find other prostitutes that might have information using some tapes of her phone calls that he had secretly recorded. But they realize that someone is stalking Bree, while Klute is falling in love for Bree and she has some sort of feeling that she can not understand for him.
Director Alan Pakula gave his composer complete freedom to use unusual percussion, a microtonal xylophone, and a breathy, “la-la” female voice to create a truly distinct soundtrack. The whole score is uneasy and arrhythmic. There is a somewhat normal, noirish love theme for trumpet with a ’70s pop rhythm, but most of the score uses quirky, even avant-garde techniques to hide in the dark corners and rafters and cause Bree to live in fear. “It penetrates you,” Jane Fonda said.