When three fifteen-year-old boys vanish from a Catholic school field trip, new Asst. Chief Mason orders Major Crimes to treat their disappearance as a critical missing. Meanwhile, Sharon receives more evidence that Phillip Stroh may be returning to Los Angeles.

While the search for the missing boys continues, the squad faces off with an untrustworthy priest, an angry ex-husband and threats from the FBI; Rusty startles Flynn and Sharon with a surprising request.