Winner at the 2016 International Latino Book Awards. Sometimes we look outside and far, losing sight of what is most important: what is inside and so close to us. One Saturday morning, the Mouse brothers set off in search of adventure. They were very happy: the big one, the middle-sized one, and the little one. Next to the path, they saw something glittering, like a little piece of the sun. It was a little golden key. But what did...