Mid 16th century . The time of John the Terrible and oprichnina . Tsars servant Yuri Volkov goes to Suzdal to investigate a long-standing case involving Solomonia Saburova Once her father was married to Grozny, but divorced, because she was barren, and married Elena Glinskaya. In general, history is really old, forgotten, ex-grown . What is the interest of John in it? And what is the king's business, that the Volkovs are distant descendants of the Polotsk prince Vseslav Bryachislavich, who seemed to know how to turn into a wolf? And the solution is simple: John believes that the wolf will find what the dogs of the sovereign could not find - will find traces of one baby prince, long gone. This boy was born Solomonia, already divorced and cut into nuns, and she gave birth and hid .