The lives of police officers working for the Los Angeles Police Department.

Veteran Los Angeles cop John Cooper is assigned to train rookie Ben Sherman, who finds himself questioning whether he has the right stuff to be a police officer after witnessing Cooper's no-nonsense approach. Other members of the police team include Detective Lydia Adams, who is her mother's primary caregiver away from the office; her partner, Russell Clarke, an unhappily married father of three; Detective Daniel "Sal" Salinger, who oversees gang detectives Nate Moretta and Sammy Bryant; and patrol officer Chickie Brown, a single mother who dreams of joining the SWAT team.