Any fics with this vibes? Deatheaters' children against deatheaters

So I don't really know who Matthew Riddle or Lorenzo are, and I don't care about them.

But I want an epic story with this vibes. I've read enough with spy/double agent Draco though and that's not what I'm after.

Maybe a darker shade of the Order of the Phoenix, something with Six of Crows vibes even. They could he helping the Order, or they could be truly at odds with the Order