The liars are breaking the law. They need to look in the barrel and find out what's inside. But the cops are on their tail and they're getting ready to arrest. What will be in the tank?

Spencer spends time with Jonny; Emily tries to figure out Talia; Hanna digs into the past of Mona's friend Lesli; Mike's behavior concerns Aria; Holbrook returns to Rosewood.

Aria hopes Andrew can be her tutor; Spencer helps Jonny with a new project; Hanna turns to her father for financial assistance; Mike is involved in an incident at the school blood drive.

The liars desperately want to know why Mike gave their blood samples and why he's visiting Alison in jail; Hanna is worried about her fee and getting admission in dance; Emily still hasn't told Talia about her biggest fear; Spencer is still confused with why Toby's not telling her the truth.

Equipped with their new information about Mona, the liars decide they need to speak to Alison; Aria quickly learns that Mike's involvement could have serious repercussions for her family; The liars intensify their search for information on "A"; Ali looks to someone surprising for help with her murder trial.

Ali has to choose between saving herself or sacrificing one of the liars.

The PLL's struggle to find evidence against "A" to help an imprisoned Hanna get out of jail. Meanwhile, Alison's trial is expected very soon and not only does it decide her fate, but it also unravels a lot of secrets the group has told.

Alison's trial comes to a close when the prosecution calls a surprise witness; The liars race to find someone or something that can prove Ali's innocence; Mike becomes a target of "A" when it looks like he might be called to testify.

'A' has always had fun playing with the liars, but now they have the biggest game to date in store for the girls.

The liars are trapped outside of Charles' dollhouse, where his games grow more sinister; Ezra, Caleb and Toby are determined to locate the liars.