Trust is hard to come by for the girls of Pretty Little Liars -- especially in the Jan. 15 episode. Recently released from the psych ward, villainous A-Team member Mona Vanderwaal (Janel Parrish) bumps into her frenemies at the local coffee shop and delivers some shocking news.

"Remember that creepy Harold guy, from the Lost Wood Motel? He was at our school stalking me," Mona tells Aria Montgomery (Lucy Hale), Spencer Hastings (Troian Bellisario), Hanna Marin (Ashley Benson) and Emily Fields (Shay Mitchell). "He bribed the real custodian so he could have the job."

"Why would be stalking you?" Spencer asks, skeptically.

Mona pauses for a moment and replies, "I used to talk to him once in a while and he sort of ran with it. When I told him it was inappropriate, he didn't take it so well. . .I told my parents and we went to the school administration."

The girls, who previously thought Harold had been conspiring with Mona all along, look at each other with a mix of confusion and intrigue.

"The police are looking for him now, but Harold's gone completely off the grid," Mona says. "I really hope they find him soon."

"You sure it was him?" her ex-BFF Hanna asks.

Who else would it be?" Mona says ominously.

Pretty Little Liars airs Tuesdays at 8 p.m. EST on ABC Family.