The Behavioral Analysis Unit profiles a serial killer who abducts two teenagers and murders one, and who will kill the other teen if they don't stop him in time.
The BAU investigates when several federal government employees, including a close friend of Walker's, succumb to symptoms of a heart attack; Reid anxiously awaits his trial date.
Morgan brings the BAU new information in the case against Mr. Scratch, a serial killer and escaped convict who has been wreaking havoc on the team.
When Reid fears his mother has been abducted, he asks the BAU to investigate while he's stuck in prison.
After Axl runs into several ex-girlfriends at a St. Patrick's Day party, Hutch suggests it's a sign and advises Axl to talk to a few of them to figure out his love life; Mike and Frankie don't share Brick's excitement over his new microfiche machine.