Izzy and her older brother, Max, are not happy when they learn that the family will be leaving the big city and moving to Oregon as their Mom and Dad have purchased a small farm and petting zoo. The only bright spot for Izzy is that she gets to pick a pony for the pony rides. She picks a small white pony named Snowflake and is convinced that the horse is actually a unicorn.
Unfortunately, Izzy seems to be the only person who can see Snowflake's glowing horn and her magical powers. When Snowflake becomes the big hit at the county fair, the mean fair owner, Mr. McFarlane, kidnaps Snowflake and keeps all the money generated by the special animal for himself. Izzy must convince Max that Snowflake is a real unicorn who needs to be rescued before her powers weaken and fade away.