Vladimir Arkhipov lived quietly in a luxurious “bachelor flat” with his faithful mastiff and had no intention of changing anything in his life. Everything happened against his will. The eccentric neighbor Lizaveta died and left him an inheritance of an apartment and her adopted “orphan girl.” The orphan turned out to be an adult girl, Masha, who shocked the imagination of the lonely Arkhipov. But why didn’t the neighbor leave the apartment to her? Is it because she was claimed by people from the “Path to Joy” sect, who began to besiege Masha immediately after Lizaveta’s death. Then a half-brother from the province fell on Masha’s neck, and then they both disappeared. Concerned about their disappearance and thoughts about the strange death of his neighbor, Arkhipov visits the “bad apartment” and finds the corpse of the sect’s lawyer there. How did he get here? Who killed him? Really... Masha?