Pretty Little Liars Season 4 Speculation: Who Is the "B" In the Box?!

Last week, the interweb was flooded with one Pretty Little Liars clue: “There's a B in the box.” Now that Pretty Little Liars showrunner Marlene King has hinted that “the box” in question is Ali’s casket, our speculation over who “the B” might be has kicked into overdrive. Here are our top three theories!


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