It happens in quick succession. The son of the professor, believed to be dead, and an order that has dedicated itself to humanity for centuries - two research partners of Jürgen Draft that shouldn't actually exist - the mysterious black-purple stone and an ancient alliance with the Freemasons and the Vril Society. Light phenomena, time and gravitational anomalies, as well as other legendary occurrences, but also clues to the Untersberg code and a goddess named Isais at the Untersberg. The connections between these things led to the adventurous yet dangerous search for the golden city at the center of the Earth being successful! Upon arriving in this mysterious inner Earth, the friends found - contrary to expectations - a revelation of the future that had been planned for centuries, as well as an ancient dark and powerful force that threatens to rise again. This is the story of humanity.