Enlisted by an archaeologist friend to help excavate a top-secret historical site, husband-and-wife team Sam and Remi Fargo discover clues alluding to the hidden tomb and treasure of Attila the Hun and embark on a high-stakes chase through numerous countries, where they are pitted against dangerous adversaries.

After surviving a bombing in Rome, photojournalist Josh Ryder is plagued by strange memories from an ancient time that instruct him to save a woman named Sabina and, desperate for answers, he consults an expert on past life experiences.

Responding to the promise of a hefty donation from an eccentric billionaire with space travel ambitions, the Santa Fe Archaeological Institute excavates the site of the 1947 Roswell incident and immediately uncovers two unknown murder victims.