were angry with Tommy at the time, and both start being much kinder to Tommy. However, the letter Janet received was written by Lou, who accidentally burned the real one, and it promises that Tommy would quit the FDNY for her, unbeknownst to Tommy. Colleen and Black Shawn finally marry. During the wedding reception, a drunken Sheila suggests Tommy and Janet renew their vows, which Colleen and Katy second. Tommy is blindsided when Janet adds a new vow of him promising to retire from active duty, and take an administrative or training job. Tommy hesitates, but after Katy threatens to start drinking and become a prostitute, he agrees to take Janet's vow. During one of Tommy's last tours of duty as a firefighter, Engine 99 and Ladder 62 respond to a warehouse fire that quickly escalates. Both Chief Feinberg and Chief Nelson take command and call for a fourth alarm. The men see hanging latex gloves and the smell of diesel fuel, realizing they are in the middle of an arson attempt. After reaching a window to escape, they hear voices of kids still inside. They locate the kids but are unable to reach the ladder, and try to make for the roof. However, the door to the roof has been bricked over, trapping them inside. The chauffeur firefighter of Ladder 62, Niels Jorgensen, reports he can't rescue the men from the outside and has to leave the roof before it collapses. Tommy is about to leave the group and look for another route out after Lou tells him to go, obviously reminded about his vow to Janet. Tommy asks if Lou is sure, and Lou replies, "We'll be fine, trust me." Seconds later, a massive explosion guts the building. The series finale begins with Lou eulogizing Tommy, Franco, Sean, Black Shawn, and Mike during a joint funeral with family, friends, and many other firefighters. This all turns out to be Tommy's dream. Tommy becomes acting Lieutenant, and while filling out a department report for Needles on that final incident, it is revealed that it was in fact only Lou who died, after having his face burned off in the fire. The recovering crew all contemplate their futures in leaving Ladder Company 62 and firefighting in general. Tommy files for retirement; Franco passes the Lieutenant's exam awaiting reassignment; Mike and Sean consider transferring; and Black Shawn considers quitting for Colleen.