Volume I

Cassandra Nott grew up believing in blood purity and the superiority of witches and wizards over Muggles. As she attends Hogwarts School of Witchcraft and Wizardry, her conviction crumbles, helped by a kind Gryffindor boy by the name of Neville Longbottom.
Or;
The world isn't split into good people and Death Eaters. We've all got both light and dark inside of us, what matters is the part we choose to act on.