"OK, explain this to me: what spell – what..... Unforgivable Curse has this ex-con, Slyherin, baby Death Eater girl cast that suddenly makes you decide to hire her – a former dark wizard – to hunt dark wizards?" Ron damn near bawled, beside himself with bafflement as he followed his brother-in-law around the shelves of the Library of Merlinment, deep in the bowels of the Ministry.