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.
T.C. and Topher rush to a concert venue where a fireworks explosion has caused panic; Syd tries to decide the best plan for her and her daughter; Paul and Shannon find they have more in common than they thought.
J.J. struggles with not being treated like an adult on his 18th birthday and 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.