It’s a shame to herd a goat at that age. So Danila goes with her to the other end of the lake, where thick grass grows along the shore. Far away, of course. But none of his friends will laugh at him. Max, a loyal friend, accompanies him. And then it turned out that the first beauty of the city, Natasha, was sunbathing nearby... Armed with binoculars, the boys gathered to keep an eye on her. But instead, they noticed how a deal took place in the middle of the lake: the cunning guys exchanged a backpack of money for a bag of emeralds - obviously real, fakes wouldn’t sparkle so much in the sun... That’s how it goes! But before the buyer’s jet ski had time to leave the kayak, a terrible monster emerged from the water and dragged the exhausted businessmen to the bottom. Who is this? Competitors or an ancient monster, the existence of which only old women believe?..