When Polly's parents go away for a week, Great Aunt Mabel comes to babysit. Polly can't wait for Auntie to meet her best friend, Gertie. But when Auntie catches Polly and Gertie chewing filthy bubble-gum they collected from the pavement, she bans them from playing together.
Polly won't let anyone keep her away from her bestest friend. The next day, she sneaks off for a joyride on Gertie's bicycle