Chief Boden faces allegations after the death of a homeless man in a warehouse fire.
Casey must decide whether to turn in a cop's son who paralyzed a teen in a drunken-driving accident; Severide learns he has a fractured vertebra; Mills is torn between his mother and the job.
Herrmann saves an infant in a blaze and the repercussions drive him on a search to uncover the truth.
Peter is deeply upset when a young victim is discovered at the site of a train accident; an abusive mother takes dire actions; Severide's injury is aggravated.
Thanksgiving proves to be a busy holiday for the firehouse - including a visit to a meth lab, a gang shooting and a 10-car pileup.