Philip (Mark Lester) is a young autistic boy living in the countryside of Northern England. With no explanation for his condition, Philip's parents search for answers without any success. When Philip encounters a rare white pony with blue eyes, he ends up meeting The Moorman (John Mills), a retired colonel who is sympathetic to his condition, and, shortly thereafter, Diana (Fiona Fullerton), a young girl his age. With the newfound friendships in his life, Philip begins to open up, but will it last for long?