After being blackmailed by A.D., one of the Liars begins to supply info to the dark side in order to protect those closest to her. Detective Furey questions how much the PLLs know about what happened to Archer Dunhill. Aria tries to issue an ultimatum to Ezra in regards to Nicole, while Emily struggles with how to support Ali. Spencer goes to elaborate lengths to meet up with Mary Drake and encounters Wren. After learning something surprising about Lucas, Hanna sets out to prove her friend is innocent and uncovers even more troubling info. And another person is brought in on the secret of A.D.'s game.