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1. A Trilogy Based On Harry's Parents
We can all agree that one of the best parts of HP7 was bearing witness to Snape's memories of Lily Potter. During James and Lily's time at Hogwarts, you had the creation of the Marauder's Map, werewolves and the rise of Voldemort. These little snippets have me dying to know more -- a trilogy of the prior Hogwarts generation would more than satisfy.