Erik Maksimov, a criminal police officer, and his friends entered into an unequal battle with mysterious enemies for the right to exist on our planet. They jump from time to time, from world to world, trying to find the main secret of the enemy. The forces turn out to be unequal, it seemed that they would not see victory, but the group had a small chance of success. To do this, Eric must make the most difficult of his journeys and go many millions of years ago into the past in the body of an ancient lizard and there complete a special task that can change the balance of power in our time.