Vertical world. Steam machine age was replaced by the epoch of аппонитовых engines. Falling a prey industrial revolution becoming poor, a young scientist Сайран sets out in the searches of treasures, falling down to the foot of the world, rock of Millennial Bulwark. Nobody disbelieves his expedition in success, except a faithful maid, friend of inventor and suspicious huntress after adventures Nelly. That waits aristocrats dare get down in a mysterious abyss under Bulwark, that доселе was only the article of rumors?