Heidi the Vet Fairy is an installment in the Rainbow Magic series, likely from a sub-series focused on jobs or careers. Heidi is responsible for the magic that protects and heals all animals, and assists veterinarians in their work. When her magical item is stolen by Jack Frost, animals become sick or hurt without any magical help, and vets struggle to cure them. Rachel Walker and Kirsty Tate must embark on a quest, likely involving a local farm or veterinary clinic, to recover Heidi's magic, ensuring that all creatures are safe, well cared for, and healthy again.