Inspector Konstantin Emelyanov rightly believes that, despite all his professional qualities, he will end his service as a simple operative - his intransigence is not liked by his superiors. And now he, an experienced worker, was sent to deal with... a domestic gas explosion in an apartment building. During the investigation, Emelyanov realizes that it was not household gas that exploded at all, but some kind of diabolical operation, during which many deaths begin to appear...