Too small for the fair? Peter and Lotta have to stay home while Aunt and Uncle Blue enjoy themselves at the fair. However, the children are not sad, as they have big plans: they want to do something nice for the grumpy washerwoman Kristin to make her friendlier. Their plan succeeds - but then a series of outrageous complications ensues, making a carousel ride at the fair seem trivial in comparison. A timeless story about security, independence, and the journey to self-discovery.