"A new friend is a scary thing, sometimes. You may have to change and adapt a little to make your friendship work ..."

So says Bat to her new friend Mr. Byrd on one perfect summer twilight. They've both landed, quite unexpectedly, on the same branch of the same red maple tree at the same time, and this story begins ...

They agree to meet at twilight all summer long. Soon, they realize they are more alike than different, and friendship takes many forms. Together, they discover the danger of cats, the beauty of fireflies, the meaning of loss, love, fun, joy, family, and more. With autumn comes change for these unlikely summer friends, and for Mr. Byrd, it brings the sweetest song of all.