In the cramped cockpit of the boat, of which Ivan Burlakov has long been the captain and where Elenka, not jokingly called his wife, works as a sailor, a new employee appears - the captain's assistant Sergei. Outwardly energetic and open, he quickly achieves Elenka’s love. And just as quickly - Ivan’s dismissal.

The film takes place during the civil war. Tolya Dergach, having lost his parents, falls under the influence of bandits looking for hidden treasure in the ruins of the estate. The boy, of course, will understand his new friends — and together with old friends will help the security officers to neutralize criminals.