Hanna worries that her mother is keeping a dangerous secret and is determined to protect her at all costs, which leads her to an uncomfortable meeting with Detective Holbrook. A clue in Ali's things leads the Liars to a creepy mask maker, who takes a shine to Emily and may have ties to another Rosewood resident. Spencer and Toby continue their search into a painful chapter of Toby's past and Melissa returns to Rosewood. Meanwhile, A targets Emily's mom, leading Aria to make a desperate plea of Ella.

Holbrook's partner, Lt. Tanner, comes to town, intensifying their investigation into the Liars and their possible connection to Wilden's death. Emily panics when her parents come under undue scrutiny due to "A's" manipulations. Hanna bristles when Caleb tries to help her through her this latest crisis, and tries to shift the focus of the police investigation. And Toby finds a new source of information into his mother's death, but it only leads to more questions. Meanwhile Aria has an uncomfortable encounter while out with Jake, and Spencer lays a trap for Melissa.