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 it open? Sometimes we look far and wide and miss the most important thing; what's so near, and within each and every one of us. Lexile Level 460L.