Ali returned on "Pretty Little Liars" season 4 episode 16, "Close Encounters." The meeting left the fans with numerous questions. Will the Liars know about the truth any time soon?

What is in store for the Liars in "Pretty Little Liars" season 4 episode 17, "Bite Your Tongue?"

Dissection of "PLL" season 4 episode 17 promo is as follows:

1. Look Mona is back!

Yes, Mona fans must be happy. She is back and in the promo looks dressed up for a meeting or something. Perhaps, she is meeting with Aria and Emily.

2. Aria is skeptical about Mona.

Aria is not happy about Mona's return.

"When it comes to me and my friends, you always have an agenda," says Aria to Mona.

"Suck it up Aria," replies Mona.

3. Emily's scene.

In the promo, she sits up in her bed. It is possible that she might have heard something. Who that can be Alison or perhaps "A?"

4. "A" Types a message.

"There's been a setback, re:Alison," types "A."

The "A" team is still active and Ezra maybe a part of it.

5. Spencer continues her investigation.

Spencer is turning out to be one hell of an investigator. In the promo, she is seen looking at something, probably a photograph of Ali's journal.

6. Mona and Ezra.

Mona enters Ezra's classroom. Is this the "dangerous alliance" the voice over is referring to?

7. Emily is in trouble.

Emily is seen screaming from a broken window.

"There's somebody in here."

In another scene, she screams, "Get me out of here."

"A" is also seen running around there. Things look bleak for Emily, but she fights back.

8. The tooth message.

The Liars remove something from Hanna's tooth. It is bizarre because it turns out to be a message for the girls. A message from "A."

"Stop looking," reads the message.

Credit: YouTube/ABC Family