What would you do if someone was watching you?

Fleeing New York City, a failed marriage and a fragile mental history, artist Robert Forrester moves to small-town Pennsylvania. There he becomes fascinated with the simple domesticity of a beautiful neighbor, watching her through the windows of her home --- until she invites him in for coffee. He is drawn into a relationship with the young woman whose boyfriend goes missing; Robert becomes a murder suspect, gradually sensing he is the target of a larger plot.