How do you cheer up a friend? Kittens Max, Cantaloupe, and Melon love the Big Tree. In spring, they climb it. In summer, they stargaze on it. In autumn, they play in its leaves. It's always been there. But now the Big Tree is sick. Really sick. And Melon and Cantaloupe's parents have to cut it down. Max is sad to lose the Big Tree, but he's even sadder for his friends. The Big Tree was in their yard for their whole lives--it...