Jason returns to Rosewood and immediately tries to get rid of Mary, but Alison tries to force him to listen to what she has to say. 

She organizes a dinner party for Jason, but he brings Aria along because he feels like she understands the most what's going on. 

Alison was furious, but tensions flared when Mary made on of Jessica's dishes. 

Mary dropped news that they used an old storm cellar. 

This sends the liars on a quest to the lair and uncover the news that Jessica was investigating on the girls for quite some time. 

They also found a medical file that stated Mary had another child. 

They hear their car alarm, but when they run out A locks them in the car and threatens that if they find out who A is before Charlotte's killer, A will kill them. 

Spencer is shocked to learn that Yvonne is hurt and tries to send them out of town, but Toby informs Spencer that he and Yvonne are leaving town with one another to start a family in Maine. 

He also revealed that he was building the house for both him and her. Spencer goes home crying after learning about it.