Credit: Adam Rose/ABC Family Channel © 2012 Disney ABC Television Group Photo: Pretty Little Liars Episode 15: Spencer and Emily

One word: OMG! Last week, Pretty Little Liars Season 3B got off to a thrilling start after Mona (Janel Parrish) made her suspicious return to Rosewood High — and this week’s follow-up didn’t disappoint. (Except, of course, if you’re a Ezria or Haleb shipper. Sorry!)

Could Byron (Chad Lowe) get any creepier after tonight's episode (Season 3, Episode 15: "Mona-Mania!”)? And why would anyone willingly go to a “party in the woods?” Read on for Wetpaint Entertainment's review of the episode, and then rate it yourself!

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Marlene King may have called Chad the “coolest” dad in Rosewood, but we think he’s the sketchiest. Seriously, was there a scene where he wasn’t acting creepy? First, he stole Aria's (Lucy Hale) journal from her room (he knew her secret hiding spot), and then he got into a fight with Meredith (Amanda Schull) after she caught him snooping in her purse — which he thought was Aria’s!

But when Meredith tells Aria the truth, she also drops a major bomb: Byron was with Alison (Sasha Pieterse) the night she disappeared. What a creeper!  

Speaking of creepy situations, Emily (Shay Mitchell) and Paige (Lindsey Shaw) find themselves alone in the woods after their plans to go to a party get derailed by the “A” team — or, in this case,  Toby (Keegan Allen). And this is why you never attend a party in the wood, especially if it’s in Rosewood. Use your head, Em!

And then there’s  Spencer (Troian Bellisario). Poor, poor Spencer. No matter how hard she tries, she keeps getting outsmarted by Mona, who just took her place as captain of the academic decathlon team. Say what? Since when has Mona cracked open a book?

Overall, we give it 4 stars. What did you think?

Catch an all-new episode of PLL Season 3B on Tuesday, January 22, 2013 at 8 p.m. ET/PT on ABC Family.