The true story of a decades-long struggle involving the Los Angeles Police Department, under the determined leadership of Police Chief William Parker, and ruthless criminal elements led by Mickey Cohen, a one time fighter who climbed to the surface of L.A.'s criminal planet. The show is a crime drama series in Los Angeles throughout the 1940s and'50s. It's a universe of glamorous celebrities, powerful studio thoughts, coming war heroes, a robust and corrupt police force and an even more threatening criminal network determined to make L.A. its West Coast base.