In the early 1950s, a huge and terrible shadow hung over the newly liberated Yinshan.

First, a woman who washed clothes in Yinshan Lake slipped and fell into the lake. Since then, she has disappeared.

Then two buffaloes playing in the lake suddenly disappeared.

Then a few geese flying north landed on the lake, but they disappeared with them, and only a few feathers floated on the lake.

Yinshan Lake, on the other hand, was as calm as usual, and people didn't notice anything unusual in the lake.

It turned out that this was a dead end planned by the Kuomintang enemies for more than a year. They took advantage of the opportunity of closing the Yinshan Lake in the past two years to put piranhas into the lake and multiply in large numbers. They ate up all the fish in the lake and then began to attack livestock and people. However, a serious rainstorm and flood are coming. If the floodgates are opened, a large number of piranhas will enter the downstream with the flood, which will endanger the water ecology of the whole new China. Rainstorm and flood will burst the dam of Yinshan Reservoir, inundate the whole Yinshan, and endanger the lives of 300,000 people. This is the enemy's plot. We can neither open the floodgates nor have to open the floodgates, and a stand-off will be placed in front of the newly born red regime.

In the face of such an extreme crisis and complicated "puzzle", all kinds of characters appeared:

Jia Simou is the boss of Yinshan Industrial Company and the largest national capitalist here. He came to Yinshan two years ago, and his behavior is unpredictable. Is he a brave man to save Yinshan or a culprit to disturb the overall situation?

Shen Ou, a young female reconnaissance section chief, shoulders an extremely arduous task. She sets her eyes on "10 1", but how can she choose because of her passionate feelings and cold reason?

Cao Jinzhou, secretary of the Municipal Party Committee, insisted on being at the forefront of flood fighting. The disaster tested his judgment and tempered his perseverance. He knew what it meant to him once he made a decision, would he say it without hesitation?

Wang Liuyi is an agricultural and fishery expert who returned to China after studying in the Soviet Union. He is warm and honest, but he is also naive. He knows the consequences are unimaginable, but how can his immature shoulders carry the sails of the boat of destiny?

Within a few days, between life and death, a huge and fierce contest began ...