Determined to be as strong and powerful as the first Harleigh, who built the rambling Weatherby Hall, twelve-year-old Harleigh Fourth and an equally diminutive new friend try to foil the plans of a distant relative who is seeking the long-lost Weatherby fortune. Harleigh J. Weatherby IV feels misunderstood. At age twelve he is about as tall as a six-year-old, and no one lets him forget it. At school the bullies nicknamed him "Hardly." Now he is homeschooled at the Weatherby mansion, where strict Aunt Adelaide is always on his case about something. Then Harleigh meets Allegra. When she literally flies over the walls of Weatherby and into Harleigh's life, the two form an unlikely friendship. Allegra is fascinated by the enormous Weatherby mansion, and against Harleigh's orders, sneaks inside. Together they discover that someone is trying to find -- and steal -- the long-lost Weatherby treasure. Will Harleigh and Allegra be able to foil the villain and save Weatherby House?