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.

Aria feels torn about how to view Jason when Spencer and Emily paint him in a negative light. Meanwhile, Hanna makes an effort to get along with her future stepsister; and mounting pressure from "A" drives Emily close to the edge.