Series: Infinity Ring

History is broken and three children must travel back in time to set it right. Dak, Sera, and Riq involve themselves in one of the most bizarre spy missions in history, and the outcome of World War II hangs in the balance. Behind Enemy Lines (Infinity Ring #6) by Jennifer A. Nielsen takes readers on a thrilling journey through time...

Dak, Sera and Riq return to the United States and find trouble waiting for them! The year is 1850 and the nation is divided over the issue of slavery. In these dark days, the Underground Railroad provides a light of hope, helping runaway slaves escape to freedom. But the SQ has taken control of the Underground Railroad from within. Now Dak...