Inman sets fires for money. Upset by his latest deed, a crime family pays another fire setter to find and kill him. The failed attempt starts a battle between the two hired torches, leaving a trail of destruction for the Boston Arson Squad to figure out. Meanwhile, the gruesome Axman strikes again, cutting the head, hands and feet of his victims and setting their wealthy homes on fire. The Arson Squad's Diana Reed and Alex Barnes become wrapped in a puzzle deeper and more dangerous than either could have imagined.