For regular readers, this story is known by the title “Fire in the Night,” assigned by the publisher to the novel without the author’s agreement. Presented here is a new expanded and revised version of the old novel with the original title “Forbidden Practices.” Enterprising руководнича lady Anna Sergeyevna Pankratyeva tries to control the people around her with a mental weapon. The secret of this weapon was shared with her by a certain Arseniy, considered a sorcerer in certain circles, who helps those who seek it achieve success. In practice, Anna Sergeyevna tests Arseniy’s theoretical knowledge and shares with him the results. However, forbidden practices are forbidden for a reason: using them is extremely dangerous.