Emily wants to swim the coveted anchor leg in a meet, but she has to battle Paige for it. Meanwhile, Hanna must repay Caleb for a favor; and Spencer has ulterior motives when taking on a tutoring job.

Stress takes its toll on the girls as they scrutinize suspects in Alison's murder, including a classmate with a grudge, a secretive brother-in-law and the ever-mysterious "A." Meanwhile, Aria uses the school play as a way to bond with Ezra.