Following his son's tragic death at the hands of a drunk driver, Tommy is stuck at the center of a family that is collapsing in crisis as the once-unshakable bonds between the firefighters of 62 Truck threaten to come undone.

Tommy continues his downward spiral following Connor's tragic death and Uncle Teddy's conviction for murdering the drunk driver who killed him. Negotiating his divorce while caring for his ailing father, Tommy faces the demise of 62 Truck, where Franco is secretly preparing for the lieutenant's exam as he desperately hangs on to his daughter. Dealing with a wife with Alzheimer's is pushing Jerry to extremes, and Mike struggles with his own conflicted sexuality while Sean embarks on a risky romance with Tommy's sister. Caught in the downdraft of a family in free fall, Tommy fights his own addictions as he faces crises ranging from his nephew's seduction by a schoolteacher to questions of paternity raised by the newly pregnant Janet's affair with his brother. But as Tommy contemplates retirement, Johnny's murder forces him to choose between his damaged family and a fresh start with Sheila.