In a convent, the Holy Saints train young girls to become murderers. Nona Gray is one of his novices. Before leaving the monastery, Nona must choose which order to devote herself to: prayers and service or blade and fist. All that stands between her and this choice is the pride of an assassin, the plans of the future empress and the thirst for revenge of the richest lord of the empire. Nona is surrounded enemy, but she will have to find her own path, despite the bonds of friendship, revenge, ambition and loyalty. And only one thing is certain: the path will be bloody.