Hmm... would a couple romance titles with ghostly characters do?
Shelly's Second Chance (first in the Wish Granters romance series, by L. B. Gshwandter), with a recently-deceased man and woman helping a living lady with her wish while trying to remember their own lives and how they died.
Time Treasure (Sheila Raye), about a modern woman treasure hunter encountering a cursed sea captain and his crew.
There's a dead girl MC in Eoin Colfer's The Wish List, a YA tale about a dead girl who must help an elderly man fulfill his bucket list, but that's probably not what you're going for...