After years of seeing her sisters suffer at the hands of an abusive prince, Marra - the shy, convent-raised, third-born daughter - has finally realized that no one is coming to their rescue. Seeking help from a powerful gravewitch, Marra is offered the tools to kill a prince - if she can complete three impossible tasks. But, as is the way in tales of princes, witches, and daughters, the impossible is only the beginning.