William needs a break from his younger brother.William's younger brother, Edgar, loves to play with him. And sometimes William likes to play with him too. But today, Edgar is too loud and destructive, and William wants to be alone. The only place he can be alone is up high in his hot air balloon. Edgar is usually too afraid to climb up, but today he wants to come along. William is disappointed but doesn't refuse. On his approach to the ladder, Edgar freezes, with queries about what if he gets hungry, thirsty, or cold, grabbing snacks and toys for comfort. William finally stops Edgar from frantically assembling these items and helps him to be brave. Dunklee writes a story that will feel familiar to readers who have younger siblings and sometimes need a little alone time. William is a great role model, demonstrating how kindness can overcome annoyance and create a fun shared adventure. The watercolor-and-colored-pencil illustrations are adorable, capturing a child's vast imagination with a light touch. Kang transforms their suburban house into a beautiful outdoor world to explore. The tiniest details give hints to the truth of William's hot air balloon. William and Edgar have peach skin, black hair, and rosy cheeks, and they negotiate their play without adult intervention.A sweet sibling story. (Picture book. 3-8)