Minor changes on Halloween; major changes for everyone involved. This isn't exactly realistic, but it was fun to write!
Voldemort's a little more strategic, and instead of trying to kill his prophesied assassin, selects a different path. One-shot, complete.
When Voldemort attacked the Potters on Halloween, the wizarding world hailed Harry's younger brother Thomas as The Boy Who Lived. But were they right? As Tom starts Hogwarts, wheels are set in motion, assumptions are questioned, and lives are changed forever. Harry's two years older than canon. Chapters 1-31 can be found at /s/13247979/1/Three-Black-Birds
Voldemort was a little more ruthless, and James was away. My version of the beginning to a Dark Harry fanfic.