A little mouse learns from old people that somewhere there is a mythical barn full of grain—a paradise for mice. He asks where to find it, but everyone laughs at him. Having waited until spring, the stubborn little mouse sets out on a journey full of dangers and trials. And yet, he finds the magic barn, where at first he feasts and enjoys life. However, over time, a Boa Constrictor crawls there, devouring the fattest and laziest. And the little mouse realizes that life in it is not such a paradise as they say.