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In a press release from ABC Family, we learn that all four Little Liars are going to Jenna’s “extravagant birthday party,” where they think they’ll be able to gather clues about who’s been tormenting them. Naturally, nothing goes as planned.
“It turns out that Garrett (Yani Gellman) is getting a pass out of jail to visit his ailing mother on the same night,” which we vaguely knew about from this spoiler about Garrett’s mother. “The timing can’t just be a coincidence; the Liars are convinced it all has to do something with ‘A.’” That’s probably a good guess!