In this title, readers will 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. Aligned to Common Core Standards and correlated to state standards. Abdo & Daughters is an imprint of Abdo Publishing, a division of ABDO.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.