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Aria begins her volunteer work at Radley and quickly gets down to business finding any answers she can about a patient of interest to the Liars. But she quickly hits a snag when she comes across an aggressive patient that may be the key to what the Liars are looking for. Also searching for answers, Spencer takes a note from Ezra's play book by borrowing some of his spy equipment to keep a closer eye on the home front. Meanwhile, Hanna is caught at odds when Ali and Caleb butt heads, and Emily seeks help from her friends when her mom invites Ali over for dinner.