At home, hardened police detective Aidan Breslin (Dennis Quaid) has grown increasingly distant from his two young sons, Alex (Lou Taylor Pucci) and Sean (Liam James), since the death of his wife. At work, he finds himself thrust into an investigation of perverse serial killings rooted in the Biblical prophecy of the Four Horsemen of the Apocalypse: The White Horseman, a master of deception; The Red Horseman, a sharp-witted warrior; The Black Horseman, a manipulative and dark tyrant; and The Pale Horseman, an executioner with disarming strength.