Harriet Tubman is famous for leading escaping slaves to freedom on the Underground Railroad. But as in George Washington, Spymaster (National Geographic, 2004), Allen focuses here on the characteristics of Tubman that allowed her to be a secret agent: her intelligence gathering, her trusty network of spies and informants, and her ability to coerce extraordinary courage out of ordinary people. Songs, artwork, maps, and codes tell the story of Harriet Tubman’s involvement in slave revolts, beginning with her own daring escape, and Civil War espionage in her work for the Union. The final chapter makes it clear that the very elusiveness that made Tubman successful also makes it hard to confirm the details of her life and service. Allen explains his research and offers more sources for readers interested in following the trail. (Ages 11–15)