Frannie and the Private Dick. Night Fall Series, #7

Bent on catching her cheating fiancé in the act, Frannie Valentine got sidetracked by a little thing like dying. When she awakens, Frannie learns her pampered life will never be the same, so she turns to the man responsible for her undeadness and demands he take on the responsibility of giving her a little job training--in the PI biz. Niall Keegan never intended to make himself a mate, but Frannie's string of minor disasters, which ended with her dying in his arms, took the decision right out of his hands.
While the mating part isn't bad, making the disaster-prone Frannie a PI may just be the death of him.