Cara is very sad when she breaks her leg and can't join her best friends on their summer holiday. To cheer her up, Mum takes her to Battersea Dogs & Cats Home, where they meet Stella, the gorgeous and gentle Staffordshire bull terrier puppy. 

Stella goes everywhere with Cara - including to a birthday party in a park! But one day she bounds onto a bus and is carried away before Cara can join her. Will Cara ever be reunited with her runaway puppy?