Fire investigator Sean McCaffrey, son of the late Steven “Bull” McCaffrey, is now working at the same Chicago firehouse along with his uncle Brian. When Sean is assigned to investigate a deadly fire, he and partner Maggie soon realize that they are dealing with something much more than a routine fire. The clues they discover lead them down a treacherous path of arson, murder, and international terrorism. Sean must use his intuition, along with the help of infamous jailed arsonist Ronald Bartel, in a race to find out who is behind the fire and stop them from accomplishing their devious plans.