Life hasn’t been kind to Sim since childhood - her parents divorced, and each began to build a new family, in which there was no place for the girl. But, despite all the hardships and troubles, Sima managed to get an education, find a job and even buy an apartment. She lovingly built her cozy little world, not letting anyone into it - she did not communicate with her relatives who betrayed her, and she simply did not need friends. But the possessed old woman neighbor took a dislike to the girl at first sight and methodically poisoned her life. Unable to bear it, Sima once called the police, and they managed to reason with the madwoman for a while, but this was only the beginning of new problems - the old woman was strangled, and her body was thrown under the door of Sima’s apartment...