Harry Potter: Rise of Altair Silver

When Altair was killed and found himself reborn into the world of Harry Potter, he thought he had been blessed by the heavens. 'Magic will be so fun. Work? Ha, just wait until I find my golden finger and rise to the top of the world without even trying. Voldemort? Pssh, I know the future, what can he do?' 5 Years Later, his parents are brutally murdered and he is kidnapped into a secret organisation of assassins. "Welcome to hell, kid."