A promise made on a winter day between two family members changes the entire future of the Wizarding World. Harry Potter and Neville Longbottom weren't the only children born at the end of July 1980—there was another, child of House Black. And when Harry finally meets this third 'Chosen One', everything will change.

When Harry boards the Hogwarts Express for the first time, he isn't the only war orphan there. There's another boy, someone who was orphaned for a far different reason than Harry. When the two literally bump into each other, a bond is forged, one they little know will prove to change Hogwarts, and indeed the entire Wizarding World, forever.