Officer Nolan, Officer Harper and Detective Lopez are assigned to the kidnapping of the son of a criminal court judge who has a long list of enemies who could possibly be involved.

After rushing his son, Henry, to the hospital following his collapse, Nolan is reunited with his ex-wife, Sarah, and they must come together to help their son. Meanwhile, Detective Lopez discovers “La Fiera” is in the same hospital and wants to find out exactly why.

When a new designer drug hits LA streets, it turns users into “zombies,” and Officer Nolan and the team have a Halloween they won’t soon forget. Back at home, Lucy questions whether her apartment building might be haunted.

Desperate to reset the way the world sees him, Officer Thorsen reluctantly decides to be a part of a reality show to help rebrand his image, only to be thrust back into yet another deadly situation. With cameras rolling, the show’s producer is found murdered and the team must investigate before Aaron is made suspect number one.

Officers John Nolan and Celina Juarez are in a race against time to stop the source of an explosive rampage.

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