Olivia Grant is a Brazilian witch, student of Castelobruxo and about to enter the sixth year. However, the Ministry of Magic asks she to go on a mission against the Death Eaters at Hogwarts. Olivia is already used to this kind of thing, after all, her parents are the best aurors in Brazil and it seems that the talent to fight the Dark Arts is hereditary ... But she didn't imagine that the mission would turn her world on its head down. And now she will have to dance with the demon to do what is to be done.