Officer John Nolan and Bailey are on the hunt for a mystery gunman after a shooting hits a little too close to home. Meanwhile, Aaron struggles to live within his means and joins Lucy to help Tamara when the mother of a child she babysits goes missing. Elsewhere, Wesley suspects that a judge is taking bribes after he excludes valuable eyewitness testimony from a case.

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.