In Lakhta, a suburbs of St. Petersburg, a monstrous crime occurred. The whole family of Colonel Bazhenov was killed. The investigation of this crime was entrusted to Nikolsky, the young investigator from the judicial department. The investigator interrogated everyone who could know about the cause of the crime. Soon Nikolsky realized that The Bloody Massacre in Lakhta (this is how journalists called this crime) is a very confusing and difficult matter. During the investigation, the famous mentalist Mayer in St. Petersburg falls under suspicion. The investigator is confident that Mayer is a very mysterious person. In addition, in the city administrative bodies there is no mention of a person with the name Mayer.