Ten-year-old Corey Birdsong, a former slave, becomes a conductor on the Underground Railroad by helping to bring a mother and daughter, runaway slaves, to his family's Amherstburg, Ontario, farm in 1859. Corey begins attending school, and his family, along with his friend, Mingo, are living well in Canada, where they've built their own farm. But, the Birdsongs cannot let go of the memories of their friends left behind in America. Corey and Mingo...