The PLLs team up with Mona to find more info about Bethany.
Feeling trapped by Alison and "A," Aria, Emily, Hanna and Spencer take a leap of faith and turn to an unlikely person for help. Meanwhile, Alison begins to build up her own army.
With Alison leading them down a dangerous path and "A" barring them from telling the police the truth, Aria, Emily, Hanna and Spencer feel trapped and are desperate to find a way out of this mess. But could the girls lose everything by putting their faith in a possibly untrustworthy ally? Meanwhile, Alison begins to build up her own army now that the PLLs have turned their back on her.
Melissa reveals her experience from the night Ali died.
Melissa (recurring guest star Torrey DeVitto) finally tells Spencer what she knows regarding the night Ali disappeared. But what is Spencer supposed to do with the knowledge? Knowing something is off about Alison's story, Emily is on the hunt for answers of her own. She enlists Ezra's help in finding out more about Cyrus and his past connection to Alison. Meanwhile, Hanna asks Spencer and Toby (recurring guest star Keegan Allen) for help with Caleb's drinking problem.
Melissa's secrets are finally revealed and Hanna demands the truth about Ravenswood from Caleb. Plus, Emily is on the hunt for answers of her own and enlists Ezra's help.
The PLLs begin to question Ali's motives.
The pressure is on for Alison to identify the man police have in custody for her kidnapping, but the Liars know if she does it would be sending an innocent man to prison and possibly walking right into an "A" trap. With Emily trying to convince Ali not to play into "A's" hand, Spencer comes up with a plan B, in case Ali decides to make the wrong decision. Meanwhile, fed up with all of the Ali drama, Hanna tries to lead a "normal" teenage life.
Alison's games may have pushed her friends too far when an innocent man's life is put in the balance, so Spencer comes up with a plan B.
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