The CBI pursues two lines of investigation when a Santa is murdered: Patrick Jane goes undercover in an AA group; and Rigsby and Van Pelt question members of the National Society of Authentic Santas. Meanwhile, following the demise of a person in custody at the CBI, J.J. LaRoche (guest star Pruitt Taylor Vince) is brought in to question the team when it appears to be an inside job. Guest star Gregory Itzen returns as retired former CBI director Vincent Minelli.
After a doctor is found dead at a golf course, the CBI team searches for a killer amongst a hospital’s staff and patients. Meanwhile, when LaRoche is placed in charge of the CBI, his first act of business is to name Cho the new team leader.
Le père de Rigsby et J.J. LaRoche sont de retour.
Jane joins a separatist commune to find out how a U.S. attorney was found dead in Mexico, even though there’s no record of her crossing the border. Meanwhile, Rigsby and Van Pelt convince J.J. LaRoche (recurring guest star PRUITT TAYLOR VINCE) to help them discover who’s stalking former CBI members.
Patrick Jane and the CBI team delve into the world of professional fighting when the body of a woman is found at a mixed martial arts match - with ties to one of the fighters. Meanwhile, Professional Standards Unit Investigator LaRoche focuses his investigation on Rigsby, who in turn is forced to ask Cho for a huge favor in order to keep his job.