Living Dead Girl by Rachel Vincent

In a return to her urban fantasy roots, author Rachel Vincent introduces a world full of action, humor, and passion, in which one heavily armed and acerbic woman must ultimately choose between herself, her love, and the fate of the entire world…

Alexandra Walker is bitter, bored, foul-mouthed, and much older than she looks. A self-styled “retrieval specialist,” she is at your disposal to reclaim whatever—or whoever—you’ve lost, and while her methods are rough around the edges, her reputation is unrivaled. Which is why an arrogant, powerful new client (species: unknown) is offering her something much more valuable than money.

A plane went down with his cargo on board, yet neither the cargo nor the copilot were found in the wreckage. Locating them seems simple enough until Lex finds herself fighting off assassins from all angles—and of all species. With a capricious hellhound at her side and some super-hot competition on her heels, it doesn’t take her long to realize that completing this mission could have dire consequences. For all of humanity.