Spencer’s mental state deteriorates while her friends fret. A reappearance proves miraculous and ominous.

Some secrets of Mona’s asylum stay come to light, a corpse must be faced, and a lost child tracked down.

Hanna comes up with a plan to save her mother from a conviction and turns to the only person she thinks can help: Mona. Caleb tries to convince Hanna that Mona can't be trusted.

The girls look out for Alison's safety after she is spooked by a recent Rosewood "accident.''

Aria searches for information on a patient; Spencer borrows Ezra's spy equipment.