The huge world is divided by the insurmountable wall of the Sredinny Ridge. The waters of the great oceans crushed it in only two places, but there is no navigator in the world capable of guiding his ships through them. And who would come up with such a crazy idea? Residents of the North know very well that beyond the mountains lies a red-hot hell, where there is no life... And what would hell be without demons? Leon emerged from a pentagram in a cell for criminals so dangerous that even talking to them is forbidden. Of course, everyone considers him a demon, although he is an ordinary person of flesh and blood and has never been beyond the Middle Ridge. Like it or not, Leon will now have to serve his master, who does not believe in either hell or heaven, but knows well what secret the great mountains of the Middle Range have been hiding since time immemorial.