One day a young man, Timothy Brooke, knocked at Mariana Stjerna's inner door and the Agartha novel was born. As described in the book, he was saved by Agarthans from a shipwreck off the coast of Canada in the mid-20th century, and is now alive and well in Agartha, the Hollow Earth or the Inner World, if you wish.
In Agartha, the Earth's Inner World is described. It is inhabited by an advanced race that is planning to come to the aid of people on the surface very soon. In the book, Timothy recounts his story and describes life in this fifth-dimensional paradise, which very likely will be your future home.
Some highlights from the book: