The Mentalist season 2 episode 17
Episode title: The Red Box
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.
