Erik Odom

In the wake of tragedy, LBPD training officer Traci Harmon takes on new trainee, Alex Diaz, who on day one is already learning the job is harder than he imagined.

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.