Pretty Little Liars

Pretty Little Liars Spoiler Pics: Season 4, Episode 18 — “Hot For Teacher”

Check out these sneak peek pics from Pretty Little Liars Season 4, Episode 18 "Hot for Teacher" (February 4). In the episode, Spencer has a revelation about Board Shorts and wants to prove her theory. And we all know how Spence gets when she's in detective mode.

Read on for ABC Family's full episode synopsis and let us know what you think of the pics in the comments!

With Spencer’s possible Board Shorts revelation, she is now more determined than ever to prove her theory before bringing it to the other girls’ attention – especially since it could have a devastating effect on one of the Liars. But with many sleepless nights fueled by prescription medication, Hanna starts to notice Spencer’s odd behavior. Will Detective Hanna be able to figure out Spencer’s secret before Spencer is ready to share?

Meanwhile, Emily looks to make amends with Alison through Shana, and all of Aria’s lies start to take a toll on her.

Catch the next episode of Pretty Little Liars Season 4 on Tuesday, January 21, 2013 at 8 p.m. ET on ;ABC Family.