Macedon. 367 BC. Philip II is bringing war to Persia. Forged in the warrior culture of Macedonia, the time has come for his young son Alexander to take up his inheritance of blood and obedience to the sword. It is a training that has made the boy sadistic; fiercely brilliant, but unstable. A dangerous trait in a king fated to rule the vastest empire of the ancient world. Compelled to teach this startling, precocious, sometimes horrifying child, Aristotle soon realises that what the boy needs most to learn - thrown before his time onto his father's battlefields - is the lesson of the golden mean, the elusive balance between extremes that Aristotle hopes will mitigate the boy's will to conquer in this age of fighting heroes...