Amid the post-war boom of Hollywood's Golden Age, Cole Phelps is an LAPD detective thrown headfirst into a city drowning in its own success. Corruption is rampant, the drug trade is exploding, and murder rates are at an all-time high. In his fight to climb the ranks and do what's right, Phelps must unravel the truth behind a string of arson attacks, racketeering conspiracies and brutal murders, battling the L.A. underworld and even members of his own department to uncover a secret that could shake the city to its rotten core.