"A" begins tormenting someone new. Meanwhile, Spencer seeks solace from the drama within her family, so she turns to Wren; and an opportunity opens for Ezra, but it may put distance between him and Aria.

The girls meet Duncan, a guy from Alison's past, and hope he can help them piece together things about her. Meanwhile, Toby comes back to town, and danger follows him; and Jason gives the girls a bag containing Alison's personal effects.