Pretty Little Liars Season 3, Episode 15 Sneak Peek: Who Started the Fire? (VIDEO)

Mona (Janel Parrish) may have won over her classmates on Pretty Little Liars Season 3, Episode 14: "She’s Better Now," but she's yet to convince the Liars that they should trust her. Can she change their minds during Season 3, Episode 15: "Mona-Mania!" (January 15)? Well, she's certainly going to try. In this sneak peek of the episode, a demure Mona tells the Liars that Harold the creepy motel guy/janitor was stalking her, and she even declares that he's the one who started...


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