An 'In the Beginning' Story Part of the Tales of Olympus universe
After the Fall of Ouranos, Cronos is King on Olympus. While he sits on the throne, schemes and plots are still brewing and the hidden threat of a prophecy which foretells that one of Cronos' children will overthrow him.
A brother and sister grow up best friends as USMC officer's children, fall in love, get married, and have a family. All this time they are being taught how to become spies for their country.