An old notebook with unique knowledge on physics was left to the family of Vasily Letunovsky before his death by a refugee fleeing the war. He asked to transfer it to the Academy of Sciences, since it contains important information that should not get to the Nazis... As they say in the dormitory of the pedagogical institute, teacher Olga Semenova was attacked by a real kikimora, a representative of evil spirits. Kikimora demanded something from Olga Vasilievna and , not getting what she wanted, killed her. Colleagues of the deceased, Alexander the First and Alexander the Second, do not believe in mythical monsters and decide to figure out what happened themselves...