First Grave on the Right by Darynda Jones — book slip

Charley Davidson is a part-time private investigator and full-time Grim Reaper. She sees dead people and helps them cross over to the other side.

When the deceased have died under suspicious circumstances, they often seek Charley's assistance in bringing their killers to justice.

Complicating her life are the intensely hot dreams she's been having about an entity who has been following her all her life, and it turns out he might not be dead after all. In fact, he might be something else entirely.

First in the Charley Davidson series.