When 7 members of their family were kidnaped by a sinister organization known as the Vespers, 13 year old Dan Cahill and his older sister, Amy, vowed they's stop at nothing to bring the hostages home. But then the ransom comes in and the Vespers demand the impossible. Amy and Dan have just days to track down and steal an ancient map. The only catch? No one has seen the map for half a century.