Credit: Video Still

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 the fire last episode.

True tale of woe, or convenient lie? Watch the clip below and decide for yourself.

Credit: YouTube Photo: Pretty Little Liars Season 3, Episode 15 Sneak Peek: Why Is Mona "Losing Sleep"? (VIDEO)

Find more Pretty Little Liars spoilers here.

Catch the next episode of Pretty Little Liars on Tuesday, January 15, 2013 at 8 p.m. ET/PT on ABC Family.

Rebecca Martin is an editor at Wetpaint Entertainment. Follow her on Twitter @BeccaDMartin.