Death magic : World of the lupi series, book 8

Recovering from an attempt on his life by an FBI traitor, Lily Yu's boss forms a ghost unity that will operate in secret-and outside the law. Lily's conscience won't let her join. Her fiancé, lupi Rule Turner, has no such reservations. But when a senator is killed, Lily's decision becomes a matter of life and death-and all the magic in between.