Byron Montgomery

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!...

Pretty Little Liars Season 3B got off to a great start last week, and tonight's episode, Season 3, Episode 15: "Mona-Mania!," promises all sorts of juicy drama.

To pass the time until 8 p.m., we've taken a close look at the sneak peeks and previews of the episode to see what we can discover about the drama ahead. Here are the nine most interesting things we learned.

1. Three of the Liars go...

Mona Vanderwaal's (Janel Parrish) back and scarier than ever on Pretty Little Liars Season 3B, and we can't wait to see what she's up to on the tantalizingly titled Season 3, Episode 15: "Mona-Mania!"

While we can't speed up time, we can make the wait for the new episode a tad more bearable  by obsessing over spoilers. To aid in speculation, we've rounded up all of the juiciest hints...