Prokhor Lykov, nicknamed Vodyany in the village for his passion for fishing, always disappeared on the shore of the lake with a fishing rod. The chairman of the collective farm decides to use his enthusiasm in his own way ...

A spy game between Reds and Whites is in full motion during Russian Civil War.

Ten steps from the round pillar, in the ruins of the old fortress of Kum-Basan-Kala, secret messages are hidden, which must be delivered abroad. For these documents, foreign intelligence sends its spy. The film tells about the events that took place in the old fortress.

On organizing the delivery of weapons to the workers' detachments of Crimea to fight Wrangel. The action takes place during the Bolshevik coup.