This is a failed novel, but a pretty good book. It doesn't really have a plot, but is instead a story designed to illustrate how perceptions shape individual realities.
A woman and her husband vacationing in the south of France have their trip cut short by his fatal accident - well, sort of. Seems he just won't stay put in the morgue. She thinks it has something to do with a vision of the Virgin Mary she once had - even though she long ago renounced her Catholicism. He implies (though never outright states) that he understands why he isn't dead, and doesn't want to be discovered until he has "recovered" from his rigor mortis-ish condition, for fear that he will be regarded as a freak. A nearby convent gets involved in the wife's reluctant vision quest, which she avoids because she doesn't want to attract publicity to her hiding husband or her own affair with another man.
The story is almost a black comedy as written by Dean Koontz. (In fact, Koontz has used variations of these plotlines in his books, namely Strangers, Shadowfires, and Mr. Murder, to name a few.) Nothing is clearly answered or resolved by the end of the story, though there are strong implications made in a number of different directions as to why the bizarre phenomena are occurring. In essence, the reader fills in his own blanks and virtually writes the story of his choice according to whose perceptions he agrees with. It's almost a Rorschach blot for belief systems.
It's also quite a good read. It will definitely not be to everyone's tastes. If you're looking for a comprehensive, standard novel, you'll be horribly disappointed. If you simply want to spend a while walking the line of Faith, examining it from every different angle and psychologically exploring the different human mechanisms of belief, you'll be endlessly fascinated.