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Chief Boden takes action to try to help a boy who was seen at two fires previouly, one firefighter is on medical leave after an accident at a fire and Casey and Dawson are gradually seeing each other.
Severide's injury gets worse, an abusive mother makes terrible decision and a train accident takes life of a young person.
Thanksgiving at the firehouse includes a 10-car pileup, a gang shooting, and a meth lab.
When Dawson faces suspension the girl she saved decides to help her. Detective Voight does everything he can to make Casey retract his statement. A dangerous action during an apartment fire may change Casey's situation.
Severide seeks an old friend's help with his injury, a disciplinary action is taken against Dawson and Casey has to deal with the aftermath of opposing Detective Voight.
An elderly woman needs Severide's help, Detective Voight tries to persuade Casey not to testify against his son, Chief Boden is accused of leaving a homeless man to die in a warehouse fire and Shay comes face to face with a man from her past during a call.
Casey has to decide if he should report that a cop's son is responsible for a drunk car accident that left a teen paralyzed. Meanwhile Severide is diagnosed with a fractured vertebra and Mills has trouble sharing his time between his mother and the job.
Lt. Kelly Severide tries to keep his shoulder injury a secret as he helps a construction worker from a collapsed building. Meanwhile two teenagers are stuck in a vehicle.
The members of Firehouse 51 struggle to cope when one of their own dies in a fire. Lt. Matthew Casey and
Lt. Kelly Severide blame each other for their friend's death. Meanwhile Casey goes through a separation with Hallie and
Battalion Chief Wallace Boden has to make a crucial decision.