Katie loves to build. She loves the way the blocks click together, the way they crash when they topple to the floor. But most of all, she loves to build something brand-new. Unlike her brother, she hates reading.

Owen loves to read. He loves the way the pages rustle when he turns them, the way the paper smells. But most of all, he loves to read something brand-new. But, unlike his sister, he has no interest in building.

When their rivalry finally comes to a head, a librarian suggests a solution. Books for Katie to read and books for Owen to shelve. Can they learn to appreciate their siblings hobbies and build something together?