Ezra is writing a true crime book about Alison. This fact was unearthed in the last episode of "Pretty Little Liars." Well, fans still doubt if he is truly writing a book or it is something else. However, the fact is Ezra lied to Aria. The promo for "Pretty Little Liars" season 4, episode 21 titled "She's Come Undone" is here. It seems that Aria is in a mess after Ezra's revelation.

1. Aria and the Liars: In one of the scenes, Aria is sitting miserably with her friends around her. She must have told them about Ezra's truth.

2. Bad times for Aria: She is a terrible state. In the promo, it is Aria sitting on a bench, or it can be Spencer. In another scene, Aria is sitting on her bed, and she looks depressed.

3. Ezra might go to jail: In the "Pretty Little Liars" season 4, episode 21, Aria announces to Hanna that she won't be the "only one who is going to suffer from this."

"Ezra's not just gonna suffer!" replies Hanna. "He's going to go to jail." Bad days ahead for Ezra.

4. Aria burns paper: The promo of the upcoming installment shows Aria burning a piece of paper. What could have been written on it? Perhaps, it is related to Ezra.

5. They pay, if the Liar goes too far:

"They'll all pay the price when one Liar goes too far," warns the promo for episode 21. Who is that Liar? Maybe, Aria. The promo points that it is Aria.

6. Spencer is still going through a rough phase: She still looks like she is in a major mess.

7. Aria freaks out: She is freaking out, throwing papers, breaking lamps and screaming. The other Liars enter and "Oh my god!" says Emily. '

Watch the promo for "Pretty Little Liars" season 4, episode 21 titled "She's Come Undone."

Credit:YouTube/TVSeriesPreviews