As the Poison Tester, it is my duty to review Harry Potter fics, and this one cured my cancer. It's just excellent in every way.
The premise is that Harry Potter from the end of book 7 transmigrates into a parallel dimension where his alternate self dies in a car crash.
Everything added is perfectly compatible to the lore of the original books. There's one part where the author forgets about the Black family motto being French, but it's an extremely minor detail.
Everything is perfect, so it's pretty impressive that the only thing I could nitpick at is that Harry is est more chatty than he is in the books, but that's completely fine.
I recommend.