King of Kings is the thrilling third installment in the adventure series for kids, following the exciting escapades of Bill and Penny as they navigate the world of currency characters. After escaping from the Philadelphia Franklin Mint in book #1 and making friends with other currency characters, they find themselves on a plane to Mexico. In book #2, they meet Peso and learn about the history of Mexico. However, their adventure takes a terrifying turn when some of them are kidnapped by the Cryptos. In King of Kings, readers will follow Bill and Penny to Brazil as they learn more about the world of currency along the way. With captivating storytelling and educational themes, King of Kings is a must-read for kids who love adventure and learning.