Red sister

At the Convent of Sweet Mercy young girls are raised to be killers. Some have inherited old bloods, which bestow upon them special talents. Sweet Mercy hones its novices' skills to deadly effect: it takes ten years to educate a Red Sister in the ways of blade and fist. But even the mistresses of sword and shadow don't truly understand what they have purchased when Nona Grey is brought to their halls as a bloodstained child of eight, falsely accused of murder: guilty of worse. In her short life, Nona has made many powerful enemies, and despite the security and isolation of the convent her secret, violent past will one day find her out. Nona must come to terms with her demons and learn to become a deadly assassin if she is to survive.