Tombstone, Arizona, 1881. The air is full of the sounds of shooting, cussing, and toe-tapping tunes knocked out at the battered piano at the Last Likelihood Saloon. After which there’s something less acquainted: the wheezing, groaning sound of a Police Box materializing. The Doctor and his companions aren’t the one newcomers on the town. The Clanton brothers have ridden in to settle a grudge with Doc Holliday, the notorious gambler, drinker, and dentist. Within the Wild West, tempers are short, guns are swift, and a moment’s hesitation at the draw can mean death.