If it wasn't a tomb, what kind of power plant does the book theorize it was?
According to the book, no king has ever been found buried in a pyramid. All of the kings were buried in the Valley of the Kings. The only mummies ever found in The Great Pyramid were placed there long after it was completed. The book speculates that the pyramid was a large chemical reactor. Shafts were crafted that fed a central chamber where a chemical reaction took place. At some point in time, an explosion occurred in the central chamber as evidenced by the wall, floor, and ceiling all being pushed outward by 1/4 inch. It was a very fascinating read. The author was a mechanical engineer. No Egyptologist on the planet agrees with him though.