Ollie is a 3-year-old girl who loves spending time with her mom. Reading books and being silly are some of their favorite things to do together. During their day mom notices a little boo-boo on Ollie and neither of them knew where it came from. After reading, talking, and acting out a few books, Ollie thinks she knows how she got her boo-boo. The mystery was brought up again at bedtime. Ollie's answer surprised her mom and made her giggle. The boo-boo is no longer a mystery.