When Mattie wishes on a shooting star for a puppy, she knows her wish is hopeless. Her dad just doesn't believe Mattie is responsible enough to look after a puppy. She finds the next best thing when she and her friend Zoë start helping the new vet and animal rescuer, Dr Polly. Mattie still may not have a pet of her own, but she has amazing adventures rescuing a runaway ferret, trying to stop a greedy goat from eating everything in the garden and looking after an adorable puppy with a hurt paw. But as the animal rescue gets more and more crowded, Mattie, Zoë and the vet's son, Casper, realize that they need to do something more. Can they help the animals find their forever homes?