Starting over isn't easy, especially for John Nolan who, after a life-altering incident, is pursuing his dream of joining the LAPD. As their oldest rookie, he's met with skepticism from those who see him as just a walking midlife crisis.

Follows the lives of the personnel of the fictional 21st District, which houses both uniformed officers and the department's elite Intelligence Unit as they fight every day to keep the city of Chicago, Illinois safe.

A mysterious "time master" from the future unites an unlikely group of superheroes and villains to save the world from a powerful evil.