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 ...
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.
