The Trap Door

"Dak, Sera, and Riq are three time travelers on a mission to save history, but they're totally unprepared for the year 1850. With the United States on the verge of civil war, runaway slaves in the South look to the Underground Railroad for help escaping to freedom. But there's a traitor in their midst. Now Dak and Sera are left wondering whom to trust, while Riq risks everything to save the life of a young boy."--