Kelpie Harper doesn't know how she is going to leave her favorite pony behind for seven whole days while visiting the country. Sent to stay with her whimsical grandmother in a log cabin in the middle of the woods, Kelpie expects to have a lousy time sitting around, painting pictures, and listening to more of her grandmother's silly magical tales. Worst of all, there's not a pony in sight. But when her grandmother gives her a mystical gift, things begin to change in a big way for Kelpie. After dozens of ponies go missing, everyone is devastated, and the police don't know where to look first....