Santo Patrocelli is a member of a secret organization of warrior priests that have been fighting an order of shape-shifting nuns known as The Gargouille since the seventh century. Believing this conflict was over, he lives in seclusion in The Philippines. When The Gargouille reemerge, he is drawn into the battle once again. This time, however, he questions the righteousness of his mission as he falls in love with one of his sworn enemies.