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Lt. Casey and Dawson volunteer to help at a charity run at Chicago Medical when a massive explosion sends Chicago into chaos. With one of their own missing in the blast, the firehouse is tested like never before.
Suicide note is delivered to a surprised Dawson and Lt. Severide digs deeper into Bloom's dark past. Elsewhere, Chief Boden learns shocking news, and with the help of Shay, Lt. Casey goes on the search for a life-changing item.
With everyone's support, Dawson makes final preparations to retake the fireman's exam, but a call to the field may throw a major wrench into her plans. Elsewhere, Lt. Casey has an important matter to discuss with Antonio. Meanwhile, Lt. Severide and the firehouse welcome Rick Newhouse, the latest addition to the squad, Shay gets an uninvited surprise guest and Chief Boden makes a bold move.
A riveting look into the everyday heroics and private lives of the firefighters, rescue squad and paramedics of Firehouse 51, where plunging into roaring infernos and putting out personal fires is just another day on the job. But there are more than just flames to battle when the station lands on the short list for a shutdown, sending the team on a rescue mission they're not equipped to handle.