
Patrick and the CBI team investigate the murder of a tutor, and find a mysterious little red box near the body, starting a chain of events that turns the murder into the search for a priceless ring stolen from the British Museum. Meanwhile, Lisbon is worried when a new boss, Madeleine Hightower, takes command of the CBI, as well as mysteriously learning about Rigsby and Van Pelt's relationship.
Jane and Lisbon learn that the Red John case has been reassigned to a different CBI team led by the straight-shooting officer Sam Bosco.