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S4 E4: 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 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.