Happy Are the Poor in Spirit — Andrew M. Greeley

Every family has a few, skeletons in their closet. The Cain family has a ghost, and it's trying to murder tie rich and famous Bart Cain. After three near-fatal attempts on his life--and three eerie phone calls from a woman who's supposed to be dead--the family is desperate enough to call in an exorcist. What they get is Bishop Blackie Ryan, who only believes in spirits of the holy sort. He learns that the ghostly suspect, Mary Anne Haggerty, disappeared in 1947--after going to the senior prom With Bart Cain. Now Blackie is raising more than the dead. He's raising some very deadly questions...