The Los Angeles County Sheriff's Department is one of the largest police forces in the world, but when the elected Sheriff dies, an arcane rule in the county charter, forged back in the Wild West, suddenly thrusts the most unlikely man into the job. That man is Bill Hollister. A fifth-generation lawman, Bill is only interested in justice; his soul wears a white hat. The bad guys don't stand a chance, but neither do the politicos in the Hall of Justice. Under Bill's command is a county-wide crew of LA's finest, including Deputy Cade Ward, a former Marine stationed in Afghanistan, eight years sober and one of Bill's few confidantes; Deputy Brianna Bishop, the whip-smart, sarcastic driver in charge of Bill's security detail; and Deputy Joseph Harris, the son of Bill's fallen partner. The dangers associated with the job often lead the police to LA County General Hospital, where Bill butts heads with Dr. Paula Reyes, the hospital's chief trauma surgeon - and his wife. Given a job he never wanted, in an unfamiliar sea of politics, Bill quickly learns that doing what is expected and doing what is right are two different things and that his innate, dogged pursuit of justice is the only skill the job truly requires.