Lucy is a human character introduced to the Peter Rabbit series, has a bad habit of losing her pocket-handkerchiefs and this time she lost 3. She searched for it high and low but couldn't find them anywhere. But what she found was something else in the hills while searching and it is a door going straight into the hill.

There, she meets an intriguing character with "hairpins" sticking out of her back who calls herself Mrs Tiggy-Winkle, who happens to be a washerwomen for all of the other animals. Turned out her missing hankies and pinny are being washed by Mrs Tiggy-Winkle.