Investigator Masha Lyubimova is used to many things, but the place where this crime occurred made her shudder. Only a madman could do something like this to a girl! Trying to decipher the signs left by the killer, Masha learned the legend of a terrible ancient Chinese custom: if a poor person couldn’t take revenge on his abuser, he would commit suicide on the threshold of his house and turn into a spirit of revenge...