Tyler and Lucinda have to spend summer vacation with their ancient uncle Gideon, a farmer. They think they're in for six weeks of cows, sheep, horses, and pigs. But when they arrive in deserted Standard Valley, California, they discover that Ordinary Farm is, well, no ordinary farm. The bellowing in the barn comes not from a cow but from a dragon. The thundering herd in the valley? Unicorns. Uncle Gideon's sprawling farmhouse never looks the same...