Slave, pirate, husband and lover: Arimnestos of Plataea has been many things in the course of his life. But men remember him best as one of the heroes of the Battle of Marathon, the epic victory that prevented all of Greece from falling under the Persian yoke. But now there is a new Great King on the throne, determined to succeed where his father failed. As rumours abound of a vast Persian invasion, an embassy is sent to forestall the threat. Arimnestos is chosen to escort them - an honour he can hardly refuse. But as the storm clouds of war gather and factions on both sides begin to weave their treacherous plots, Arimnestos' journey begins to look more and more like a suicide mission.