Credit: Video Still

Hanna's mom is under arrest, and things are more desperate than ever on Pretty Little Liars. What happens next? This preview of Season 4, Episode 7: "Crash and Burn, Girl!" (July 23) gives us a peek at what's to come.

In this exciting promo, we see Caleb and Toby have teamed up to try to track down "A", the Liars try to find another suspect, there's a "game changing clue," and it looks like a car crashes into Emily's house — while her mom is in the living room! Oh no!

Here's the official synopsis of the episode.

Caleb and Toby team up to investigate "A" and what really happened the night of the lodge fire and encounter a source that points to a new possible identity for "Red Coat." Hanna struggles to act like everything is normal and her friends are unsure about how to help her. Aria worries about Mike's behavior in light of an incident at school and Ezra struggles with how he now fits into her life.

Meanwhile, The Liars are determined to find a new suspect in Wilden's murder and their tactics have unintended consequences. And, "A's" new plan threatens to send everything crashing down around one of the Liars.    

Check out the preview below, and tell us what you think in the comments!

Credit: Youtube Photo: Pretty Little Liars Season 4, Episode 7 Promo: Car Crash! (VIDEO)

Find more Pretty Little Liars spoilers here.

Catch the next episode of Pretty Little Liars on Tuesday, July 23, 2013 at 8 p.m. ET/PT on ABC Family.