In 'The Metal Monster', Abraham Merritt takes readers on an epic adventure through the Trans-Himalayan mountains, where Dr. Goodwin and his companions encounter a powerful woman, Norhala, who controls living, metallic geometric shapes capable of destruction. As they follow her to a hidden valley, they discover a metal city ruled by the Metal Emperor, which threatens to engulf them in war. With the fate of the world hanging in the balance, it's up to Goodwin and Drake to find a way to escape the city's grasp and warn the world of the dangers they have encountered.