The leader of the wybmars, Guy, looks like an ordinary, unremarkable man—only at first glance. In truth, Guy is five hundred years old. Long ago he betrayed the Shnyr, made a contract with a mighty elf, and ever since has been searching for a way to break into a parallel world—a “two-world”—to seize it, take it for himself, and enslave it. And it seems Guy is already very close to his goal: all the wybmars’ forces have been drawn to Yekaterinburg at the Geological Museum. That means Sasha, Ulu, and Rodion must, by any means necessary, find out what Guy found there.