Riley and Langston are taken hostage after a gang-related shootout in a normally quiet Las Vegas community.
The team plunges into the world of military enlistment when a Marine recruiter is murdered; Natalia's ex-husband asks out one of her colleagues.
The team searches for the killer of a champion debater, who people believed had committed suicide after losing a debate.
It's frenetic pandemonium at the hospital when another Richmond emergency room shuts down, forcing Christina and crew to care for an onrush of extra patients.
Sebastian prosecutes the racially charged case of a black girl who was the victim of a fatal hit-and-run moments after leaving a party in a wealthy white neighborhood.