
Starting over isn't easy, especially for small-town guy John Nolan, who, after a life-altering incident, is pursuing his dream of becoming an LAPD officer. As the force's oldest rookie, he's met with skepticism from some higher-ups who see him as just a walking midlife crisis. If he can't keep up with the young cops and the criminals, he'll be risking lives -- including his own -- but if he can use his life experience, determination and sense of humor to give him an edge, he may just become successful in this new chapter of his life.

With help from the FBI, Lopez puts everything on the line to help Elijah Stone take down a gang leader in exchange for her safety; Nolan and Bailey must deal with the secrets and shady dealings his late mother left behind.

The team must stop a militia from detonating a highly combustible truck in their possession; Nolan, Thorson, Juarez and Harper search for three men who may have been exposed to Ebola.

John and the team welcome two new rookies and continue the hunt for two dangerous inmates with very personal vendettas following their prison escape.

The team is tasked with community policing while hunting for a local vigilante; Celina's instincts are tested; Tim and Lucy discover secrets about the two new rookies.