Alison's mom comes back to town and asks the girls to take part in a charity fashion show, which Mona helps run when Spencer gets too busy. Meanwhile, Aria works on stirring Jason's memory; and Emily questions the open dating policy she has with Samara.

Mounting tension takes its toll on Emily, who winds up in the hospital. Meanwhile, Spencer and Aria try to link a broken field-hockey stick to Alison's demise; and Hanna deals with her dad's impending wedding and Caleb's possible departure.