Ace309, I didn’t actually read it in a book, but some years ago now, when I was traveling through the far northern regions of Kashmir, a small pocket of Tibetan culture (Ladakh), it was repeated to me by several Lama’s and Tibetan’s.
I was surprised to be repeatedly told two things that seemed to be common knowledge to them, the first was that some Nostradamus like oracle had long ago predicted the 13th would be the last Dalai Lama. The other thing I was repeatedly told, as though every child knew it but me, was that the next ‘Buddha’ would rise in the West. They were very surprised that I, from the west, was unaware of this.
I assumed it would be widely written about simply because of how they spoke of it, but I could be wrong, on reflection. Don’t know if any of that helps you or not.