When a body is stolen from the coroner's van the team stumbles onto a lab performing genetic testing on human hibernation. The team's two other cases involve a man impaled in a medieval suit and a man found stabbed with an ice pick in his expensive hotel room. The investigation leads them to a woman who has made a pact to die with three of her friends. She backed out and tried to stop her friends, but it was too late. Stella asks Mac to approve the purchase of a kit that will allow the lab to run a DNA test to determine if she's HIV positive.