Looking for title/author of fiction book. Dealt with out of body travel.astral projection?

I need help finding the title of a book. I read it many years ago…probably in the 80’s, but it could have been published before then. It just keeps popping up in my mind! It was about a man whose daughter had joined a cult. The leader of the cult is capable of astral projection (out of body travel). In order to fight the leader, the father sees some type of “guru”(?) who gives him a “crash course” in astral projection. Learning to do it so quickly would supposedly lead to either mastering it, or insanity. Part of the training involved staring at a wall for hours(?) days(?). Eventually, the father learned astral projection, fought the cult leader while out of body, and defeated him by cutting a cord that lead back to his physical body. I think the cover MAY have had a picture of a teddy bear with a knife in it? …and maybe a rat? Now that I think of it…the cult leader may have taken over the body of a rat at some point…. Does this sound familiar to anyone? Thanks for any help!

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Tags: Astral Travel, Cult Leader, Teddy Bear