24. I'm a Good Girl, I Am

Lesli Stone testifies that Mona once wrote her a letter saying that Alison threatened her life. She also tells the jury about her suspicions of the other girls and Mike Montgomery. Spencer and Emily look for a way to confirm Alison's alibi. They track down a girl named Kendra who hid in the park on Thanksgiving while she waited out a bad drug trip. Alison's lawyer speaks with Kendra, but decides she won't be a reliable or effective witness. 'A' mails a severed cow tongue to the Montgomery house. Ezra gets Mike out of town by bringing him to his cabin, but Caleb accosts them when they arrive.

He urges Mike to testify. Ezra argues that Mike (16) is too young to make that decision. Mike steals Ezra's car, but his drive home is interrupted when an arrow pierces his windshield. Caleb and Ezra run through a Pathfinder Scout camp, dodging more arrows before finding Mike tied to a tetherball pole. They tell Detective Tanner what happened, but she doesn't take them seriously. Andrew is jealous that Aria is asking favors of Ezra, but he fails to be there for her when she needs his help. Aria looks at Andrew's yearbook application and is amused to learn that he was a Pathfinder Scout.

Hanna and Alison find creative ways of exchanging information, going so far as to injure themselves so they can talk in the jail's infirmary. They pass a note back and forth containing the three phrases from Mona's bedroom. Toby is unsatisfied with the level of responsibility that is being asked of him at the police station. Spencer hints at her recent infidelity, and Toby decides to get his priorities straight before he loses her for good. Alison takes the witness stand. Her lawyer demonstrates that she has limited strength in her right arm due to a childhood injury, while Mona's killer had no such limitation.

The prosecutor then brings up an archery competition that Alison won as a child. Her ability to finesse a bow and arrow seems to prove that her arm injury is just another fabrication. Alison later confesses to her lawyer that her archery win was illegitimate. The jury finds Alison guilty, and the rest of the liars are arrested as accessories. ' A' ending: 'A' uses dolls to act out a scene where a prison van drives to a castle.