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.