Frank and Joe Hardy's efforts to retrieve a top-secret invention from a scientist's house in Bayport leads them to a mystery involving a dangerous gang of jewel thieves and smugglers.

From clothesline codes to surveillance satellites and cyber espionage, Janeczko uncovers two centuries' worth of true spy stories in U.S. history.

A collection of short biographical sketches describes the background stories and pivotal achievements of six of history's most famous war spies, including Sir Francis Walsingham, Belle Boyd, Kim Philby, Virginia Hall, and Allen Dulles.

"How did real-life spies communicate in secret? Readers get a sneak peek at real spies and the gear they used to complete their missions!"--

"Who were history's most courageous spies? Who had the biggest transformation? In the History's Yearbook series, readers will learn about the amazing and diverse women in history. In Girl Spies, readers will discover and rediscover their favorite heroines and learn about top women spies who have made an impact. Each book in this series is written at a higher maturity level using considerate text at a lower reading level in order to engage struggling...

"Spies gather information on the sly! Discover the origin of spies, their historical development, famous spies, key skills and traits, and details about weapons, training, and assignments. Fast facts, maps, infographics, a glossary, timeline, index, and historical and color photos supplement easy-to-read text."--Amazon website.

Gives readers a thrilling, behind-the-scenes look into how World War II spies gathered information for the Allied and Axis powers. Learn about the tools that daring spies used during this conflict, and how spies such as Josephine Baker and Juan Pujol risked their lives to defeat Nazi Germany. Additional features include a Fast Facts spread, critical thinking questions, a phonetic glossary, resources for further study, and an index.

Recounts the efforts of Josephine Baker, Ian Fleming, Virginia Hall, and Moe Berg to collect information that helped the Allies win World War II.

Explores the lives and daring deeds of spies during the Cold War using photos, original sources, maps, timelines, and little known facts.

Explores the lives and daring deeds of spies during World War I using photos, original sources, maps, timelines, and little known facts.