Young French archeologist, Dr. Claire Dorval, is drawn in 1967 to the then peaceful kingdom of Afghanistan to examine an engraved stone found in the Hindu Kush. In the process, she discovers a 23-century-old message from Alexander the Great concerning a reserve hidden for his Afghan Queen, Roxanne, in case something happened to the young conqueror.
The "riddle" relates to where the reserve was left, and the question of whether it's still there is a monumental one. Alexander inherited from ancient Persia some 3,000 tons of bullion and jewels worth more than 20 billion of today's dollars.
Claire's discovery leads to a suspenseful search, to political intrigue, to danger, honor, and a poignant and compelling romance.
Set against the magnificent background of Afghanistan, the novel takes us from the towers of Notre Dame to the lofty peaks of the Hindu Kush and from the heights of earthshaking archeological discovery to the wondrous depths of the human heart.