This book is not at all a continuation of the novel “Donkey Shura,” although the main character here is the daughter of Donkey Shura. Her name, like her mother’s, is Alexandra. A girl, with the help of her friend, learns how to travel through time. The traveler can move into the body of a double living in another era. In the Middle Ages, the heroine's double was the young wife of Baron Gilles de Rais, nicknamed Bluebeard. Shura, through the twin, becomes acquainted with the witchcraft mysteries that the baron was interested in and helps the twin avoid devilish captivity. With the help of a time machine, she enters the body of another double - a monk of the Bon Po religion and learns that there was already a civilization on earth. But the most important task is to help the boyar Morozova, who also turned out to be one of Alexandra’s temporary twins, cope with the dark forces.