Liam and Leo are twins who couldn't be more different. Liam is loud, curious, and always ready with a joke. Leo is autistic, quiet, and sees the world in colors, patterns, and pictures. Some people say they are "accidentally related," but this school year will prove otherwise.Across a series of heartwarming and sometimes challenging moments - a birthday party, a storm at the store, an art fair, a school play, and more - Liam learns how to stand up for his brother, and Leo learns that his voice matters, even when it doesn't use words.By year's end, the twins create their own way to communicate and share an important message with their school: Different isn't wrong - it's just different.Hand in hand, they walk home knowing that being twins wasn't an accident at all, but a perfect gift.