Harry Potter knew quite a deal about fairness and unfairness, or so he had thought after living locked up all his life in the Potter household, ignored by his parents to the benefit of his brother - the boy who lived. But unfairness took a whole different dimension when his sister Natasha Potter died. That simply wouldn't do.

Hell was, Snape decided, a crowded railway platform.Post Deathly Hallows. Contains spoilers.