When best friends Dak and Sera tumble upon the key to time travel, a hand-held device known as the Infinity Ring; they're swept up in a centuries-long secret war for the fate of mankind. Their first stop? Spain, 1492, where a sailor named Christopher Columbus is about to be thrown overboard in a deadly mutiny.

"Dak, Sera, and Riq return to the United States and walk right into a deadly trap. 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 and Sera are left wondering who to trust ... while Riq risks everything to save the life of a young boy"--P....

Fix the past. Save the future. World War II is raging across Europe, and the Axis and Allied powers are in a stalemate. Dak, Sera, and Riq can tip the scales in the Allies' favor . . . if they can pull off the most daring spy mission of all time. But even if they succeed, are they playing into the SQ's hands?Jennifer A. Nielsen, author of THE FALSE PRINCE, brings her talent for intrigue and suspense to the Infinity Ring series! Praise...