With Mona making inroads in the game, Emily reluctantly teams up with her to investigate the doctor who performed Ali's procedure. Ashley returns to Rosewood to check on Hanna and asks Caleb what his intentions are with her daughter, to which he admits that he wants to marry Hanna and the two become engaged. Meanwhile, "A.D." sends Aria to deliver to a gift to the Hastings family that contains a voice recording of Peter and Mary discussing Jessica's murder, leaving Spencer more confused than ever about who to trust. Ezra notices Aria's change in attitude and fears he may have lost her; and "A.D."'s machinations cause Aria to have a terrifying nightmare.