Kyla follows the postcard clue to the Salem Chapel BME Church, which was part of the Underground Railroad, helping American slaves escape to freedom in Canada. The spirituals sung in church could be secret codes that gave slaves clues about how to escape! E.B. meets a First Nations guide, who shows him how native tribes aided escaping slaves; then he visits a “safe house” across the Canadian border. The “Band of Angels” were the people who, like Harriet Tubman, took personal risks to help escaping slaves find freedom.