The BAU team investigates a series of brutal home invasions and murders in California's Inland Empire that appear to be gang-related, but their investigation may uncover a more sinister motivation.
A fireworks explosion at a local concert sends patients streaming into the emergency room; Syd returns from Afghanistan and struggles to get back to normal.
J.J. struggles with not being treated like an adult on his 18th birthday; he learns a valuable lesson from Kenneth; an exchange student moves in with Taylor; Dylan is recruited to be on the school's wrestling team.