In the Ancient World, one army was feared above all others. 401 BC. The Persian king Artaxerxes rules an empire stretching from the Aegean to northern India. As many as fifty million people are his subjects. His rule is absolute, though the sons of Sparta are eager to play the game of thrones . . . Yet battles can be won - or lost - with a single blow. Princes fall. And when the dust of civil war settles, the Spartans are left stranded in the heart...