Arcane Chaos by Joey W. Hill

When Death pays a visit to Ramona’s shop, it seems only polite to invite him in. Particularly when he has intense green eyes and can kiss like that…

A Grim Reaper knows how and when every living thing will die. But Silas can’t see Ramona’s death. It’s one of many reasons the Chaos witch intrigues him. But when a dire threat to a single soul calls him away, it reveals something is out to destroy the order of life and death in the world. The only one who might be able to help him untangle the snarl of Fates’ loom might be the woman whose power—the very make of her soul—is the antithesis of order.
If they survive the evil that wants to destroy everything that matters to them both, Ramona wonders if she’s finally found the male who won’t run from who and what she is. Suddenly the term “Death is the only certainty in life,” isn’t a threat—it’s a promise.