Ah, is it the one by Garth Nix? The fandom of that books shares the Sabriel tag and sometimes they get mad about the slashy shippy stuff in the Sabriel tag aha ;3;
But I think that’s a girl
That’s, yes, a girl, by the name of Sabriel.
She’s pretty much a hunter/exorcist type.
The book’s part of a series (The Old Kingdon/Abhorsen) and it goes like so: Sabriel -> Lirael -> Abhorsen
It’s a pretty cool fantasy series and worth checking out (Biased opinion sorta because Garth Nix to me is god. Keys to the Kingdon series, anyone?)