Misnamed by her teacher, seven-year-old Just Grace prides herself on being empathetic, but when she tries to help a neighbor feel better, her good intentions backfire.

Willow is very shy. Her home is in an abandoned mailbox, and she'd rather stay put. Outside is noisy in a scary kind of way. It's much nicer to stay inside, drawing. But then a young boy drops a letter in Willow's mailbox: it's a note to the moon asking for a special favor. Willow knows that if she doesn't brave the world outside, the letter will never be delivered, and the boy will be heartbroken. Should she try? Can she?

Ten-year-old Caitlin, who has Asperger's Syndrome, struggles to understand emotions, show empathy, and make friends at school, while at home she seeks closure by working on a project with her father.

After Estrella's father is deported because he is an illegal immigrant, her teacher at school invites her and the other students to meet around an old oak tree and share the things they wished their teacher knew about their life at home.

The next chapter of Olive's story, tackling new friendships, middle school conflicts, and the importance of empathy.