One Grave At A Time by Jeanine Frost Book

This is book 6 in the Night huntress series. How do you send a killer to the grave when he’s already dead? Having narrowly averted an (under)World War, Cat Crawfield wants nothing more than a little downtime with her vampire husband, Bones. Unfortunately, her gift from New Orleans’s voodoo queen just keeps on giving—leading to a personal favor that sends them into battle once again, this time against a villainous spirit.