How does this sound?
Harry Potter has a younger twin sister.
Her name is Eliza “Ella” Potter—and the night Sirius Black falls through the Veil, everything fractures.
In the chaos of the Department of Mysteries, Bellatrix’s curse strikes true. Remus pulls Harry back from the edge—but Eliza slips free. She runs after her godfather, chasing his shadow into the whispering archway.
The Veil claims her.
Or it should have.
Instead of reuniting with Sirius… instead of her parents… Eliza is torn away—thrown backward through time.
She wakes on the night of her and Harry’s eleventh birthday. A bang at the door. Hagrid has come to take them to Hogwarts.
This time, Eliza remembers everything.
She can change what was lost. She can rewrite what is coming.
But the Veil does not give without taking.
Eliza begins to see ghosts no one else can see. She hears a voice calling her by a nickname she’s never heard before—yet somehow knows belongs to her. And with every change she makes, the feeling grows stronger…
She was not meant to come back alone.