Pretty Little Liars Season 4 heads "Into the Deep" on Tuesday night.

On the latest installment of this ABC Family hit, look for Paige to throw Emily a surprise birthday party, with guests who are even more of a surprise.

Elsewhere, Mona will offer a major assist to Hanna and Ashley, while Ezra will receive unsettling news and Emily will meet with a well-known swimming coach.

In our first sneak peek at the episode, we see Spencer and Aria listening in to a conversation that involves Jenna. And some serious shadiness:

As for Hanna and her mother, they finally get some good news in the following clip. But it's comes with a major (read: expensive) caveat:

Visit TV Fanatic soon after this Pretty Little Liars Season 4 episode concludes for our weekly recap and review.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.