Gemma is the youngest of a big family - what with her parents plus Six older brothers and sisters, there isn't room for anyone else. But then they meet Petal, the adorable dachshund puppy from Battersea Dogs & Cats Home, who quickly makes herself at home! Mum and Dad decide to take everyone to the funfair one day - but Gemma and Petal end up losing their way and getting separated from the rest of the family. Can Gemma's plucky puppy lead the way back home?