With the help of her veterinarian grandmother and the other volunteers at the Wild at Heart Animal Clinic, eleven-year-old Maggie rescues sick puppies from an illegal puppy mill.

After Sunita's beloved pet cat, Mittens, gets injured on her watch, she wonders if vet work is right for her. She takes an internship at a research lab, but learns that they test on animals and eventually put them to sleep. Sunita loves animals, but can she find a way to work with them without harming them?