7x19 - Quincy, M.E.

A woman, Vicki Maguire, who has suffered from agoraphobia, manages to finally leave her house, for the first time in seven years. While walking her dog along the beach beside her house she looks in through the window of another house, and witnesses what she thinks is a woman being strangled. The police are called and when Monahan and Brill get to the house there is no body, no sign of a struggle and a completely different man in residence. No one believes her story, except for her psychologist Dr. Rainer, and she goes to see Quincy. She persuades him that the woman wasn't seeing things and that he should help her find out the truth, before she suffers a relapse and will never be able to leave her house again.