A terrible storm, a young girl's dream, and the last hope against a dark force...
Nine-year-old Kaylee Winkles has always dreamed of having her own horse. She's had her own fish, parakeets, turtles, and hamsters, so surely she's ready for a horse! Her parents, however, disagree; Kaylee is welcome to help with the animals at her parents' clinic, but she's just not old enough for a horse of her own.
One night, a terrible storm-full of thunder and lightning, but no rain-erupts over the ranch. In its aftermath, Kaylee finds a mysterious guest on her property: a tiny horse.
Kaylee quickly discovers that her new friend is no ordinary horse, but a baby unicorn! The last of her kind, in great danger from a dark force whose only goal is to imprison the unicorn and hide her from the world.
With the help of her family, Kaylee must stand up to the evil that would lock away the unicorn and defeat the darkness before it overtakes the light.