Two firefighters of Engine 17 of the Chicago Fire Department are brothers. Lt. Stephen "Bull" McCaffrey, the elder, is experienced, while Brian has labored under his brother's shadow his entire life. Brian returns to firefighting after a number of other careers falter, though Stephen has doubts that Brian is still fit to be a firefighter. In 1971, Brian witnessed the death of their firefighting father, Captain Dennis McCaffrey, while accompanying him on a call. The longest-serving of all the men at Engine 17, John "Axe" Adcox, served under the McCaffreys' father and was like an uncle to the boys when their father died.
