At the start of Season 4, Tommy Gavin finds himself in as much hot water as ever. After rejecting Sheila's offer to retire from the FDNY and live out the rest of their days together in a beach house she purchased with her 9/11 widow money, Sheila drugged Tommy and threw a fit that resulted in the beach house burning to the ground. Given his cloudy memory of what happened and his past history of violence, drinking, and blacking out, Tommy is now under investigation by the insurance company for starting the fire. Word of Tommy's situation is also spreading throughout the FDNY, causing the higher-ups to consider launching an investigation of their own, threatening not only Tommy's job but his freedom as well.
