Alison returns to school with her chin up and a goal of righting past wrongs, but Mona and her crew are not in a forgiving mood. Meanwhile, Caleb comes back to town, and so does an old enemy.

Aria does volunteer work at a mental hospital and crosses paths with an aggressive patient. Meanwhile, Spencer borrows some of Ezra's spy tools; Ali clashes with Caleb, which makes things awkward for Hanna; and Emily's mom invites Ali to dinner.