Thirteen-year-old Dan Cahill and his older sister, Amy, have committed a string of thefts that lands them on Interpol's Most Wanted list. But the crimes are not Amy and Dan's fault. A shadowy organization known as the Vespers has kidnapped seven members of the Cahill family. If Amy and Dan don't deliver a series of bizarre ransoms, it's lights out for the hostages. Until now, Amy and Dan have stayed one step ahead of the police and managed to keep their family safe. But all that's about to change. Vesper One commands them to steal the Golden Jubilee, one of the world's largest diamonds. What Amy and Dan don't know is that the Jubilee is a setup...and someone is going to die.