Cooper Arcano is working on a big mystery: figuring out his grandfather's true identity. If his suspicions are correct, he will also crack the FBI's most famous unsolved case - the disappearance of skyjacker D.B. Cooper - and maybe find some stolen cash. Cooper's family could use the money, and proving himself right could help win back his best friend, too. With his furry partner, Dana Scully, at his side, can Cooper uncover the truth? And what else will he find if he does?