Originally published: New York: Orchard Books, 2018.
Before Mac Barnett was an adult, he was a kid. And while he was a kid, he was a spy. Not just any spy. But a spy for the Queen of England. The precious Crown Jewels have been stolen, and there's only one person who can help the Queen of England: her newest secret agent, Mac B. Mac travels around the globe in search of the stolen treasure - but will he find it in time? With colour illustrations and fascinating historical facts masterfully sprinkled throughout, this series offers adventure, intrigue, absurdity, history and humour.