A galloping horse interrupts a sleepy afternoon as Thaddeus rides into the life of young Harriet. The Fugitive Slave Act is about to send a river of freedom-seeking men, women and children to the historic Elgin Settlement in Canada, where the Underground Railroad has carried Harriet and hundreds more. She is determined to become a courier like Thaddeus for the secret black anti-slavery Order. As she welcomes newcomers to the Settlement, Harriet...