Attack of the Mary Sues

Cliche title. Cliche Sues. Cliche OOC. Cliche . . . you get the idea. The Death Eaters first clued in by their suddenly numerous new recruits - recruits of nothing but underage teenage girls. So they go back to where the problem first started - Hogwarts, Marauder Era. But fitting in with the student body is harder than it seems - and there may well be a Mary Sue in their midst.