Now that they know A isn't working alone, the pretty little liars have decided to act. Hanna is playing nurse to one of A's victims. Emily's digging into Ali's past at the mental hospital. Spencer hires a private eye to stalk her stalker. And when Aria's dark secret from Iceland finally comes to light, she discovers that the one person she's trying to protect from the truth may have known it all along.

Aww, how sweet—the liars think they can track me and my helper down. Too bad for them we're always ten steps ahead. And our next move is going to crush them completely.