The Bedroom Window (1987)

Synopsis
In director/writer Curtis Hanson's 1987 chiller The Bedroom Window, architect Terry Lambert (Steve Guttenberg) experiences a most disorienting turn of events when his French lover, Sylvia (Isabelle Huppert) - the wife of his boss - walks over to the titular window in-between lovemaking sessions and witnesses a mysterious man strangling a helpless victim (Elizabeth McGovern). By the time Guttenberg comes to the window, he can see only a crowd of spectators. Because Sylvia wants to avoid a messy involvement in the case (which would soil her reputation, ruin her marriage and cost Lambert his job), Guttenberg agrees to pretend that he witnessed the attack. The ruse, of course, leads to a myriad of complications. And meanwhile, with the psycho still on the loose, Lambert sets out to find him. ~ Hal Erickson, All Movie Guide