This intriguing series will immerse readers in the covert world of spies! Each book shares true stories of spies throughout history taking on secret missions, investigations, and infiltrations. Readers will also learn about the different tools, tips, and tricks used by spies as well as career opportunities for those aspiring to become a spy. Aligned to Common Core Standards and correlated to state standards. Abdo & Daughters is an imprint of Abdo Publishing, a division of ABDO.