Seth has been living for the summer with Luke and his divorced father in Portland, while Ryan has been living with the pregnant Theresa in Chino. Sandy tries to persuade Seth to return home, and is forced to call upon Ryan for help. Meanwhile, Summer claims to have gotten over Seth running away, while Marissa falls back into her old drinking and drug habits. Also, the evil and paranoid Caleb confides in Sandy that he feels he's under observation.