According to the Prophecy, Lord Voldemort was to mark his adversary as his equal. This required him to make a choice - between two baby boys.
So what if he chose the other one?
This is the story of Harry Potter, eldest son of parents who suffered horrifically at the hands of the Lestranges, but got through it. He can't wait to start Hogwarts and meet the legendary Neville Longbottom, the Boy Who Lived. But is not-particularly-heroic Neville up to the challenge?