On a visit to her grandma’s farm, eight-year-old Mia discovers a newborn, orphaned lamb outside in the cold and takes her to the laundry room, naming her Nattie. As she tries to nurse the lamb back to health, Mia discovers that Nattie is different from the other lambs and struggles to fit in with them like Mia does with other kids her age. When her grandmother says she will sell Nattie to a neighbor, Mia must come up with a plan to keep her friend around—one that will show the family just how special Nattie truly is.