I don't remember the name of the book, or the author.
It was from the late 70', early 80's of the horror/occult genere.
Setting is (as I remember it): This family moves in to this house and the wifes spirit gets stolen by a evil entity. In order to get her spirit back, the husband studies under a master of astral projection. The husband battles the entity on the astral planes and defeats it thus winning back his wifes spirit.
Key scene from the story is a battle between the husband and this possesed witch puppet that the daughter had. I remember this battle taking place on a staircace.
Any leads would be much appreciated, I've wanted to re-read it for years!