Last Tuesday, seasoned fans of the hit ABC Family show "Pretty Little Liars" learnt about Mike's involvement in Mona's fake death in order to frame Alison for murder. Mona made a deal with the devil or as fans call A, and framed Alison so that they could get rid of the mysterious bully for good. Unfortunately, no one knows where Mona is and the liars think the worst may have happened to her.

Episode 21 promises to be interesting and with only four episodes left for the big A reveal, fans are on the edge of their seats. With new information regarding Mona's alleged death, Aria, Emily and Hanna visit Alison in jail. The promotional video clearly hints that Aria tells Alison everything, but the latter says she needs to tell her lawyer about this, reports WetPaint. However, Aria begs Allison to keep it to herself and not use her get-out-of-jail-free card since it may land Mike in trouble.

Amidst all this drama, Spencer heads to Oxford for an important college interview. Looks like Melissa's contacts did come in handy after all. There she meets handsome Colin who is also Melissa's friend.

Mike seems to be in danger after he spilled the beans to his elder sister. In the promotional video, Hanna says, "A is tying up loose ends. And Mike is one of them." With Mike's life in jeopardy, the liars try to procure information on A which leads them to a hospital's burn unit. Emily, on the other hand, enrolls for the beauty pageant and is seen practicing her dance routine but something may go horribly wrong. A bloody bag and a broken vial of blood from the same bag are also seen in the video. Additionally, Alison receives a doll dressed in orange prison uniform in jail.

TVLine reports that Hanna will be in jail with Ali, despite all the trouble the liars go through to keep her out of prison. Photos of the March 10 episode reveal Hanna in an orange jumpsuit with her frenemy Alison behind bars.

Episode 21 titled "Bloody Hell" airs on Feb. 24 at 8 p.m. ET on AMC Family.