Ten years ago, Hotch and Rossi, as part of the BAU at the time, worked on a mass murder case in Boise, Idaho, where bright and well liked but narcissistic North Valley High School student Randy Slade killed thirteen of his classmates in a lunch hour shooting and cell phone detonated bombing in the school's cafeteria. He himself was also killed. As several of the survivors return to Boise to commemorate the ten year anniversary of the massacre, a copycat killer seems to be on the loose. The local authorities and media believe that Randy's then seven year old brother, sweet but impressionable Brandon Slade, now a student at North Valley himself, may be involved, which Hotch and Rossi, based on what they knew of Brandon ten years ago, don't believe. What the BAU glean early in this updated investigation is that Randy did have a hit list of people he wanted to kill, and that the latest victims are on that hit list. The list itself is comprised of popular students and students on the fringe, which strengthens the BAU's theory that Randy had a partner who went underground after the massacre. But when someone not on the list is one of the latest victims, the team have to look specifically at the massacre itself to see if there are any triggers from that day which may have set off these latest round of killings. Meanwhile, Hotch is trying to deal constructively with Jack in what looks to be a case of him being bullied at school. And Morgan and Reid embark on a game of oneupmanship on each other, all stemming from Reid knowing a little more about basketball than he initially let on.