In a provincial small town the state of emergency is announced: in a local hospital admitted pupils of private liceum with attributes of a poisoning. The suffered children - from a class of Aleksandra Simonova. Investigation of this strange case is entrusted to the inspector on especially important issues of city Office of Public Prosecutor - Tatyana Kulik. She considers various versions of the incident but nobody from workers of a grammar school does not have any motives for a crime.