Polly is a clever little girl. She likes to explore the world, figure out what's going on around her, and guess what other people are planning. She's turning five today, and Mom has something fun planned for her birthday. Polly wants to unravel the mystery, but she can't—Mom won't let her stay in the kitchen!

Dad is going to take Polly to the park to play before her birthday party, but before they set off, Mom gives Polly an early present: a giant strawberry! Polly decides to hold on to it and not eat it right away. After all, it's a special birthday treat.