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Operator Konstantin Emelyanov rightly believes that, despite all his professionalism, he will end up as a mere opera singer - his intransigence does not please his superiors.
And now he, an experienced officer, has been sent to deal with... a household gas explosion in an apartment building. Out of anger, Emelyanov does the unacceptable - he gathers the residents of the building and interviews them all together, not individually. And suddenly he realises that it wasn't household gas that exploded at all - it was some kind of diabolical operation, during which many deaths occurred, and Utesov's daughter Dita was involved in this story...