Adventuremice: Otter Chaos - Philip Reeve

Meet Pedro. He's tiny, but while looking for a BIG adventure he is rescued by the ADVENTUREMICE - a brave, determined team who keep all the Mouse Islands safe from harm. Pedro's dream is to show he's heroic enough to join their ranks. And he soon gets the chance to prove himself, when a big scary otter starts causing trouble in the waters nearby . . .