A new police detective investigates the Liars' possible connection to Wilden's death; Emily's parents are scrutinized; Toby receives more information regarding his mother's death; Spencer sets a trap for Melissa.
Despite Spencer's brave face, Aria, Hanna and Emily remain concerned about their friend's health; shocking revelations are revealed.
Ezra's new family situation eats away at Aria; Jamie is haunted by his shady past; Spencer seeks answers regarding Mona's stay in Radley Sanitarium.
Aria, Emily and Hanna suspect the worst when Spencer goes missing; Emily meets Olympic champion swimmer Missy Franklin.
Spencer is ready to talk; Ashley is involved in a hit-and-run accident; Hanna hides a new secret; Aria contends with Ezra's new life with Malcolm.