Melissa Ponzio

Chief Boden makes a risky, last-minute decision in order to save the squad trapped in a burning warehouse.

Frustrated by Lucas' growing popularity at school, Nathan searches for Lucas' weak spot. He decides to romantically pursue Lucas' friend Haley as revenge. Meanwhile, Peyton is furious with Lucas for submitting her drawings to the local newspaper without her knowledge.

When the squad is summoned to the scene of an accident, Chief Boden makes a split-second decision that overrides a fellow Chief.

Patterson steps in as chief, and Dawson becomes a target of the conspiracy. Also, an act of violence changes Firehouse 51 forever.

Patterson questions Boden's ability to lead the firehouse as the trial approaches; Brett and Chili find an unconscious man in a garden; Otis tries to fill his social calendar.

Tension between Severide and Captain Patterson finally reaches boiling point, meanwhile Cruz is visited by an old friend of his brother.