A fire at a boarding school leaves Lt. Severide shaken and wondering if he could have done more. Meanwhile, with the firehouse in full support of Dawson as she retakes the fireman’s exam, Lt. Casey attempts some political maneuverings on her behalf... (more). Elsewhere, Mills looks for answers about his father’s mysterious past and Chief Boden’s grand plans take a detour.

Amy Morton, Edwin Hodge, Kenny Johnson, Melissa Ponzio, Randy Flagler, Robyn Coffin, Sophia Bush, Vedette Lim