Becoming a Suspect for the 99Th Time, Policewoman's Wife Was Shocked

Some Relatively Niche Books

Is there one where the main character turns into a ghost? Don't use the system, don't use plug-ins. I've read a few books before, but unfortunately they are too niche and no one has read them. The writing is better, and don't post the kind that can make people look at the head and guess what the next sentence is.