When seven-year-old Pollywina Grubble'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 finds out that Polly and Gertie have chewed filthy bubble-gum they collected from the pavement, she bans them from playing together.Polly's miserable enough without having to eat the disgusting dinner that Auntie's cooked. And if she throws it in the bin, she'll be in even more trouble. There's only one solution for Polly. She waits until Aunties not looking, then stuffs the yucky food in-between the clean sheets in the linen cupboard. But Auntie soon discovers the filthy mess and sends Polly to bed with no supper.The next morning, Polly sneaks off to Gertie's house, and the two rascals head off for a joyride on Gertie's new bicycle. Polly sits in the basket attached to the handlebars, but as they go down a hill, Gertie pedals way too fast. Polly yells at her to stop, but Gertie never listens to anybody and ends up running their headmistress off the footpath. The headmistress is just as mean as Auntie, and now the two rascals are in even bigger trouble.