Rosie and Danny are brother and sister who live on a big cattle ranch in the wilds of Wyoming.

The ranch has been in their family for over a century, so they know the land wellor so they think. One day, something very strange happens. Two tiny horses appear, no bigger than a foot, and the kids name them Gypsy and Buck.

Rosie isn't sure she wants to tell anyone about the tiny horses.

They might think she's crazy! She keeps the mysterious creatures a secret for a while until she finally decides to tell her parents and the vet, Dr. Adams. Gypsy and Buck shock everyone, but her father has an answer. His grandfather always said the ranch had a secret.

Is it possible the little horses have been appearing at their family ranch for decades?

As Rosie does some researchand digs into her great-grandfather's journals she begins to believe the horses have something to do with earthquakes. Its a magical mystery that travels through time, but Gypsy is the only one who knows the whole truth!