The team travel to Portland to stop a gang of suspected murderers, that appear to be targeting a new victim each night before they can strike again.
Detective Voight plays with fire to get Lieutenant Casey to retract his statement; paramedic Dawson receives help from a girl she saved.
A murder case draws Jane and Maura into the world of criminal art forgery.
Severide meets an experimental surgeon and reunites with his estranged father; Boden tries to save a kid from a life of crime.
The Firehouse 51 crew have a Thanksgiving to remember when drugs, a car accident, and a gang shooting get in the way of traditional holiday pastimes.