Anthony Ferraris

Severide investigates a suspicious high school fire. Novak gets an unexpected call.

Cruz hunts for the identity of an unknown ally. Mouch takes steps to help a friend.

Firehouse 51 must band together after a devastating fire catches them off guard. Vasquez continues his quest for answers.

Vasquez fights to prove himself at 51. Violet and Novak pursue a troubling mystery.

Following the subway tunnel collapse, Ruzek and Kidd treat injured passengers and track down the missing offender. Archer and Frost perform a life-saving amputation. Lenox feels the weight of the CPD's hopes as she fights to save one of their own.

Severide puts his job on the line to help out one of their own. Kidd navigates Natalie's complicated relationship with her sister. Herrmann prepares to take the Chief test.