Chief Boden and his wife donna have a hunch that a recent school fire was casused by a young arsonist who goes to that school. Casey and Severide investigate the aftermath.br br Season 6 Episode 2 "Ignite on Contact"br Boden, Casey and Severide investigate the fire at Donna's school and discover that it was arson and that one of the kids might be involved. Meanwhile, after a heated exchange at a call, Mouch challenges Firehouse 87 to win the firefighter muster and recruits Brett, Hermann, Otis, Kidd, Casey, and Cruz along with the rest of the Firehouse.