As the months-long investigation into the serial killer reaches its close, Voight must outsmart the offender in a race against the clock.
Intelligence chases down a lead in the ongoing serial killer investigation as news of the case reaches the public.
Upton becomes consumed with a decades-old missing person's case linked to Petrovic after a young child shows up at the district seeking help.
Tasked with shadowing a crisis prevention team, Upton finds her approach to policing at odds with the team's mental health clinician. The case brings out Upton's personal struggles, Voight stands by her.
Intelligence teams up with ASA Chapman to take on an abduction case involving a teenager.