A retired couple are dead in Baltimore, Maryland but when the BAU become involved they find that there is a great deal more involved in the case than just the one murder. The crime scene shows evidence of torture and there is evidence of a third victim whose body parts are found in various areas of the neighbourhood. When Gideon and the team think they have a good lead on the identity of the unsub, they are surprised to learn that the FBI's organized crime unit wishes to take over the case but when they realise that their suspect is in fact an undercover agent, they must work with the organized crime squad to try and track down the murderer.
A good episode but predictable in places. Nonetheless, very definitely worth a look.