When her abuelo is injured at the local landfill, second-grader Sofia is determined to transform the dangerous Mount Trashmore into a park, taking on City Hall in the process.

Lou and her friends run faster than airplances. They build mighty fortresses. They rescue wild animals. Lou is brave enough for everything! That is, until her friends decide to climb a tree. Lou has never climbed a tree before. She doesn't think she can do it. She likes her adventures to be down, not up! But when the excuses run out, it's time to face facts: this adventure looks like fun! If only Lou could climb trees. Is she brave enough to try?