The books of Stewart Edward White on his and Betty's efforts into metaphysics are simply the best out there. Though they are 60-85 years olf now, nothing since then has surpassed them. The Unobstructed Universe (TUU) is the single best book in the genre, IMHO. I am no pushover (I am an engineer), and I have no patience for New Age gurus. Curiosity got me interested in this area as a young man, and I was lucky to have found such a solid effort very early in my inquiring. I still use the information from TUU to weed out garbage, and there is plenty in this field. But not Stewart Edward White's work. It is too bad that someone hasn't followed up on the work he and Betty did. The world would be the richer for it.
White's books are humble statements of what they experienced, without drawing a lot of attention to themselves. They were practical people who had open minds. They needed - and got in spades - "evidential", and once they found they weren't off on some wild goose chase, they worked hard to get the best understanding of what was coming through, as well as what was going on.
When Betty herself died, Stewart was able to affirm that the being that was claiming to be Betty was, in fact, the personality Betty that he had been married to. And then they went forward from where they had left off.
I could not recommend any book any higher - of any kind of book whatsoever.