Iris and Walter's teacher is out sick, and Iris's grandpa is the substitute! At first Iris is so excited to have Grandpa as the teacher. But she soon discovers that sharing her grandpa with the rest of the class isn't as much fun as she thought it would be.

In the eighth book of the award-winning Iris and Walter series, Iris learns that sharing someone you love is hard . . . but that her special bond with Grandpa can never be broken.