D-Day, June 6, 1944: one of the most expansive army endeavor in history.

No less than world cooperation would lower Hitler and the Axis power. Therefore people — and children — across the globe lent

their part.

From your young US soldiers in the boats to spies in the French countryside, the coordination of thousands came together.

Alan Gratz, writer of the New York Times bestselling Refugee, explores the need of teamwork and heroism in dismantling

tyranny in this epic, yet personal, take a look at D-Day with time for the 75th anniversary of the procedure.