Klute asks Cable for an additional $500 to buy the "black book" of the first prostitute who apparently committed suicide, telling Cable he is certain the book will reveal the identity of the abusive client. Cable corners Bree and reveals that he sent her the letters, explaining that Gruneman had interrupted him when he was attacking a prostitute. Certain that Gruneman would use the incident as leverage against him within the company, Cable attempted to frame Gruneman by planting the letter in his office. He confesses to the killings. After playing an audiotape he made as he murdered Page, he attacks Daniels. Klute rushes in, and Cable jumps or is thrown out a window to his death (the film uses ambiguous editing).
Daniels moves out of her apartment with Klute's help, though her voiceover with her psychiatrist reveals her fear of domestic life and a likelihood that the doctor will "see me next week."