The investigation into the murder of a U.S. attorney in Mexico leads Jane to join a separatist commune in order to find out whether her death was a one-off killing, or part of a larger government conspiracy. But as seen in the clip below, exclusive to TVGuide.com, he unfortunately fails to gives Fischer (Emily Swallow) a heads-up about his plan before executing it.
Meanwhile, back in the States, Rigsby (Owain Yeoman) and Van Pelt (Amanda Righetti) are back! The P.I. pair team up with former CBI head J.J. LaRoche (Pruitt Taylor Vince) to find out who's stalking former members of CBI.
Check out an exclusive sneak peek at "Black Helicopters" below:
The Mentalist airs Sundays at 10/9c on CBS.
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