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Hanna comes up with a desperate plan to save her mother from a conviction and turns to the only person she thinks can help - Mona. Caleb tries to convince her Mona can't be trusted, causing Mona to prove her loyalty in the most unexpected way. And Spencer returns to an old haunt to investigate new evidence relating to Wilden and his surprising ties to another mysterious death.
Meanwhile, "A's" recent machinations take their toll on Emily and her mom, driving Emily to reconnect with her old boss Zoe to look for an escape. And Aria relies on Jake to help her understand Mike's new attitude, leaving them both confused about the nature of their relationship.