Severide attempts to save a train driver who has been shot during her midnight shift by a group of thugs.

Season 3 Episode 4 "Apologies Are Dangerous"
Severide gets involved in a subway shooting which questions his position at the firehouse. Meanwhile, Dawson has her first day as a candidate at Firehouse 51 and Mills adjusts to his new role as a Paramedic. Elsewhere, Brett's ex-fiancé comes to town to win her back.

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