When Leo, the city mouse, visits his friend Zoe in the countryside for the first time, he meets a huge and horrible monster. It&;s gigantic, has lots of horns, an enormous tail, and when it roars, the earth shakes. At least that&;s what Leo saw. Or did he? Zoe thinks his description sounds just like Berta, the sweet-tempered cow in the meadow . . . Bestselling author Marcus Pfister skillfully weaves a hilarious story of mystery, suspense and just a hint of scariness.