Bound To Stay Bound

		Spy communication (Spy Guide (Abdo & Daughters))  Author: Olson, Elsie  Publisher:  Abdo (2025)  Dewey: 327.12  Classification: Nonfiction  Physical Description: 64 p., col. ill., 25 cm  BTSB No: 690020  ISBN: 9781098293147  Ages: 10-14  Grades: 5-9  Subjects:  Cryptography  Ciphers  Espionage  Spies  Communication
	Price: $28.66

Summary:
Learn how spies used covert communication techniques such as secret codes, invisible ink, and tiny cameras to pass intelligence to their handlers. Real life spies and missions are explored. Readers can also try making their own invisible ink, dead drops, and secret codes.