Sergei Lisichenko, nicknamed Lis, operative of the Institute of Experimental History, is in anguish and confusion: there is no partner and friend of Valdar Kamdil nearby, the future seems vague and joyless. And then the leadership, contrary to the desire of the Fox, sends him as an instructor to the Institute Polygon in the role of mentoring three interns, one of whom, as it turns out, is “one”. “Times are wild, manners are vile, ages are dark,” the trainees are in a hurry to please Mr. Instructor . But the curriculum for the first time is simple: to find out the features of the reproduction of dragons, not to be eaten by a harpy, to kidnap the rightful heir to the throne from under the nose of the villain, to defend the city during the assault and learn the first two rules of the noble robber ...