Credit: Video Still

Whether he's Alison's (Sasha Pieterse) baby daddy or not, there's no question that Detective Wilden (Bryce Johnson) is hella creepy in this sneak peek of Pretty Little Liars Season 3, Episode 20: "Hot Water" (February 19).

In the clip below, Hanna (Ashley Benson) spills to Rosewood's worst cop that the Liars know about his boat trip with Ali and CeCe (Vanessa Ray). Will showing their hand backfire?

Credit: ABC Family © 2013 Disney ABC Television Group Photo: Preview Clip of Pretty Little Liars Season 3, Episode 20: Wilden Gets Threatening (VIDEO)

Find more Pretty Little Liars spoilers here.

Catch the episode tonight, February 19, 2013 at 8 p.m. ET/PT on ABC Family.

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