Closing Doors (Paperback) by T A Pratt

Marla Mason has been a runaway, an apprentice sorcerer, a magical mercenary, ruler of a city's supernatural society, an exile, an occult detective, and a freelance monster hunter-and now, in her final adventure, she's the god of Death, facing off against a malevolent cosmic force that threatens all life on Earth. Oh, and she has to choose a mortal consort to rule the underworld by her side, so while the planet is being threatened, she also has to go on first dates. Monsters, banter, moral and physical jeopardy, jokes, thrills, and tragedies await in the final installment of the Marla Mason series.