This looks cool: Uncanny Ink 1-3 box set by David Bussell and M.V. Stott.
Unscrupulous and lethal, Erin has everything she needs to be an assassin in a world full of mobsters, monsters, and magic.
She wasn’t born with powers, but thanks to her Uncanny Ink—arcane tattoos that transform her body into a magic-fuelled killing machine—she’s more than a match for anyone dumb enough to stand between her and getting paid.
Fresh out of prison, Erin wastes no time getting back to what she does best: running down wanted men and claiming their bounties.
But when a powerful demon lurking in a black cathedral hires her to round up an errant soul, the creature offers a reward far more valuable than money…
He offers Erin the key to unlocking her tragic past. The key to the mystery surrounding her long-lost brother.