Maple and Willow do everything together. They love playing outside throughout the whole year, welcoming the sun, rain, leaves, and snow. But it's not always sunshine and rainbows, because sometimes big sisters can be bossy - and sometimes little sisters can be frustrating. And even the best of friends need a break from each other...at least until they can no longer bear to be apart.
When Maple is tiny, her parents plant a maple tree in her honor. She and her tree grow up together, and even though a tree doesn't always make an ideal playmate, it doesn't mind when Maple is in the mood to be loud - which is often. Then Maple becomes a big sister and finds that babies have their loud days, too. Fortunately Maple and her beloved tree know just what the baby needs.
Maple and Willow have always been inseparable. So what happens when Maple starts big-girl school and Willow stays behind? Well, of course, both girls have marvelous adventures of their own, but the truth is, they miss each other. And when they see that the missing is mutual, they find a unique way to feel connected even when they have to be apart.