“Pretty Little Liars” (8 p.m. EST, ABC Family) After their recent encounter with “A,” Aria, Emily, Hanna and Spencer think they may be closer than ever to figuring out who “A” really is. But when the girls decide to enlist Caleb’s hacking skills to help with their quest, Hanna no longer wants a part of the plan. Instead of focusing on figuring out who the “helper” is, Hanna decides to put all of her efforts into throwing a surprise party for Caleb. But will a surprise party at Spencer’s lake house be the diversion Hanna is looking for, or just a recipe for disaster? Meanwhile, Aria and Ezra must deal with the aftermath of coming clean.
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