Third Time's the Harm

Jamie Whitehall Olivian has received a mysterious letter from her Uncle James. She is named after him, but she has never seen, met, or heard him mentioned in any way. Until now. And he has died and left her his entire estate.
But it seems Uncle James wants her to investigate a murder. His, that is. It also seems the estate is contingent upon her acceptance of this commission. Jamie wants no part of the investigation or of the estate. She gets along perfectly well, thank you very much, a fact she emphasizes to his lawyer, who just happens to be gorgeous, making it a little harder to say no.
Things take a strange turn when the victim himself asks her to reconsider. For reasons unknown, Uncle James has been unable to depart for the afterlife and is stuck in his Art Deco desk. Jamie decides to take on the job of niece and sleuth, with no experience at either, and she and Uncle James set out to find the killer. They are aided by the lawyer and a not-as-gorgeous and slightly rumpled homicide detective whose interest seems to be more than just finding a murderer.