When a young boy goes missing from his home in St. Louis, the BAU reinvestigates a similar cold case to search for the UnSub.
Team Scorpion must find a boy from Ralph's class who goes missing on a field trip after he accidentally has a run-in with a deadly criminal. Also, Toby gets closer to finding out the identity of Happy's husband.
Barry decides to rush a fraternity, but it doesn't quite work out as he expects; Beverly and Murray find themselves getting closer to being empty nesters, which means more hobbies and activities for Beverly and more TV for Murray.
Nathan is assigned to cover a Sci-Fi Fest for his workplace and runs into a famous book author who has hated him since grade school. Meanwhile, Adam has an identity crisis when he learns that much of what he was taught on the commune was based on the mythology of Star Wars. Ed Begley Jr guest stars.
