Sam and Remi Fargo are intrigued when an archaeologist friend requests their help excavating a top-secret historical site. Clues point to the hidden tomb of Attila the Hun, who was reportedly buried with a vast fortune that has never been found. As they follow the trail through Hungary, Italy, France, Russia, and Kazakhstan leading them not to one tomb, but five the Fargos will find themselves pitted against a thieving group of amateur treasure hunters, a cunning Russian businessman, and ruthless Hungarian who claims direct descent from Attila himself and who will stop at nothing to claim the tombs' riches as his own.