Twelve-year-old Gen, a foster child living in New York, discovers she is a long-lost princess of the Kingdom of Raldonia, and must solve the mystery behind a threat to the crown.

After twelve-year-old John Boarhog's mom dies, the last thing he wants is to be schlepped off to the Jersey Home for Boys, where kids are forced to make skinny jeans for hipsters and are fed nothing but kale. Instead, he makes himself a snug home in the ceiling of the New York Museum of Natural History, where he reads anything he get his hands on and explores the artifacts afterhours. But when a rare Egyptian ruby--the highlight of the museum's new...