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With Spencer's possible revelation about Board Shorts, she is now more determined than ever to prove her theory before bringing it to the other girls' attention - especially since it could have a devastating effect on one of the Liars. But with many sleepless nights fueled by prescription medication, Hanna starts to notice Spencer's odd behavior. Will Detective Hanna be able to figure out Spencer's secret before Spencer is ready to share? Meanwhile, Emily looks to make amends with Alison through Shana (recurring guest star AERIEL MIRANDA), and all of Aria's lies start to take a toll on her.