Twelve-year-old Mary was disabled at the age of four by the same virus that took the life of her mother. While she longs to have a horse of her own, she is limited to reading horse books. A talented artist, she spends her days on a blanket in the grass sketching the horses at the farm next door. She falls in love with one of the foals and is outraged to learn the filly is considered worthless as it was born lame. Mary befriends and enlists the help of twelve-year-old Laura, whose family owns the horse farm and together they struggle to save the foal.