The team probes the death of a sailor found clutching an officer's sword and discovers he was obsessed with a role-playing game.
When new evidence suggests murder, Lilly and Scotty reopen the 1998 case of a wealthy family matriarch (Donna Mills), whose death was originally ruled an accident.
More questions arise when the Grand Central Station bombers are revealed; back at Quantico, the recruits receive time off for the holidays.
A former agent and profiler tasks the trainees with looking at serial killer cases and finding the victim who doesn't fit in; an FBI team interrogates Alex; Ryan's life hangs in the balance.
Ted is forced to take his daughter to work when the nanny calls in sick; Linda's ex-boyfriend comes back to town.