1885: Irishman Ben Donigan has come to the United States in search of his estranged brother, now a priest. Thomas's last letter speaks of traveling to a distant, secluded place called Harmony. Ben finds the city, a massive fortress miles away from civilization, and boasting an impressive population.But not all is as it seems. Why do the people go about life with a sense of dread, especially when Thomas is mentioned?And why does nobody dare venture beyond the city walls after dark?