Private detective Tatiana Ivanova found a disabled girl Lisa, who disappeared from her own yard. Now the detective is eager to find the scoundrel who abused the sick child for three days. Traces of the scoundrel lead to other crimes, but the victims this time were not lucky, unlike Lisa, they were not left alive. On the back of all the victims written in black color word "STAN", and Tanya at all costs need to solve this sinister rebus ...