When Cybill decides to base her character in Ira's new play on Maryann, she begins to shadow Maryann's every move. But, when Maryann tells Cybill that she's not welcome to accompany her one afternoon, Cybill secretly follows her anyway. When she spies Maryann suspiciously meeting a man at his apartment, Cybill assumes that her friend is having an affair, only to discover an even stranger truth. (thetvdb.com)