Aiden hates moving to the city with her mother after her father dies unexpectedly. She mourns her father, misses the farm, and doesn't fit in at her snooty private school. But then she hears about the stash of valuable coins called gold falcons hidden in the Ingle Building. Her search for it unleashes a remarkable chain of events and brings her in touch with unforgettable characters, including smart-aleck elevator operators, an eccentric millionaire, and a mouse that appears to appreciate opera.