The liars decide they need to step up their hunt for A. 

Spencer is called to a meeting, but she gets the shock of her life when it's Yvonne there. Someone set it up for them and Spencer knows it's A. 

Yvonne accidentally leaves her phone behind and Spencer gives it to Caleb to try and figure out who the new big bad is, but the curiosity gets the best of him and he looks into files about the campaign. 

Spencer goes to give it back, but Mona shocks her by showing up for it and promising to say she doesn't know she had it. 

When Spence quizzes her, she says they have all grown up and don't stalk each other anymore. 

Caleb lies and puts a virus on the hard drive A wants with a message, causing A to get a virus. 

Sparia breaks into Sara's hotel room in order to find out what she's really up to. They find a hole in her closet, but have no idea where it takes them to. 

Aria's mom and dad are back together and engaged. it helped Aria rule Byron out.

Ali helps Spencer donate her eggs, but they are both shocked to learn that the family don't want them.