An amateur hunter Eckels buys a time travel in the Mesozoic era.

The damn adventure that a real hunter can ever dream of. Traveling sixty million years ago and the greatest booty of all time.

Hunter Travis reports severe restrictions. You can only kill an animal that already dies. You can not go off the anti-gravity path, which isolates the aliens from the future. Returning in due time, it is necessary to destroy all traces of being in the past. No effect on the world can be exerted.

The time machine is a delicate matter. Without knowing it, we can kill some important animal, pichuga, bug, crush a flower and destroy an important link in the development of the species.

Hunters arrive in the Mesozoic and delve into the vast jungle. Seeing a tyrannosaurus, Ekels is frightened - it seems to him that it is impossible to kill this monster,

It walked on huge, shiny, springy, softly stepping legs. Over thirty feet it rose above the forest - the great god of evil, pressing the watchmaker's fragile hands to the oily chest of the reptile.

The hunter gets scared, leaves the anti-gravity trail and heads straight to the jungle. While the guides fight the dinosaur, Ekels somehow returns to the path and hides in a time machine,

Returning in due time, hunters unexpectedly discover that their world has changed. The colors and the chemical composition of the atmosphere, the person, and the spelling rules of the language have become different. Instead of a liberal president, a dictator is in power.

With all the pores of his body, he caught something strange, alien. As if somewhere, someone whistled a whistle that only dogs hear.

Ekels examines the soles of his boots and discovers a butterfly adhered to one of them, which he accidentally crushed as he made his way through the prehistoric jungle. Mortally frightened, Ekels offers to go back and fix everything, but Travis does not listen to his miserable babble, he raises his gun: "... And thunder struck."