Elektros returns to Athens to find a city awash in overconfidence after their victory at Marathon. As confidante to Themistocles, the unofficial ruler of Athens, Elektros understands what most people do not: the Great King is preparing to invade again, this time with the largest army in human history, accompanied by a huge war fleet. As Themistocles must convince the Athenians that their very survival requires them to build their own war fleet, Elektros closely witnesses the dirty, dangerous, and hopelessly complicated world of Athenian politics.