Colorado, 1887. After killing a bank teller in cold blood, two notorious outlaws (Corey Johnson, Raffaello Degruttola) take a stagecoach full of passengers hostage in a bid to aid their getaway. Little do they realise that amongst the passengers is Deputy Marshall Jake Norman (George Blagden), an enigmatic gunslinger and the last person the outlaws want standing in their way. However, it soon becomes apparent that a bigger menace lurks in waiting; one to be feared by civilian and outlaw alike... A beast that only appears on the night of a blood red moon.