Thirteen-year-old Dan Cahill and his older sister Amy, who committed a series of thefts, are wanted by Interpol. But Amy and Dan are not guilty of their crimes. A secret organization known as the Vespers kidnapped seven members of the Cahill family. If Amy and Dan do not get the ransom, it will mean the death of all the hostages. So far, Amy and Dan have managed to stay one step ahead of the police and keep their family alive. But soon everything will change. Vesper-One orders them to steal the Golden Jubilee