In Shiang, the young king rules without dissent. Mazer swordsmen stand watch on every corner, looking for the first sign of rebellion. This city is a place of quiet dignity, like a man eating rice with a razor pressed against his throat. Yet with one sharp movement, order is overturned. The balance of centuries is undone in the sudden spill of blood - and in the darkness, something terrible returns to Shiang. Far to the west, four Shiang masters approach the city walls of Darien. The sword saint and his companions have crossed a continent to bring an old man home for punishment. 

The city of Darien stands at the weary end of a golden age. Twelve families keep order with soldiers and artefacts, spies and memories, clinging to a peace that shifts and crumbles. The people of the city endure what they cannot change. Here, amongst old feuds, a plot is hatched to kill a king. It will summon strangers to the city - Elias Post, a hunter; Tellius, an old swordsman banished from his home; Arthur, a boy who cannot speak; Daw Threefold, a chancer and gambler; Vic Deeds, who feels no guilt; and Nancy, a girl whose talent might be the undoing of them all.

When Cyrus, brother to the Great King of Persia, attempts to overthrow his reckless sibling, he employs a Greek mercenary army of 10,000 soldiers. When this army becomes stranded as a result of the unexpected death of Cyrus and then witnesses the treacherous murder of its entire officer corps, despair overtakes them. One man, Xenophon, rallies the Greeks. As he attempts to lead them to freedom across 1,500 miles of hostile territory seething with adversaries, 10,000 men set off on the long way home.

On the plains of Marathon an army of slaves gathers. Under Darius the Great, King of Kings, the mighty Persian army - swollen by 10,000 Immortal warriors - have come to subjugate the Greeks. In their path stands an army of freeborn Athenians and among them is fearsome and cunning soldier-statesman, Xanthippus. Knowing defeat means slavery lends keenness to his already sharp blade. Yet people soon forget that freedom is bought with blood.

After years fighting to reclaim his rightful home, Uhtred of Bebbanburg has returned to Northumbria. With his loyal band of warriors and a new woman by his side, his household is secure – yet Uhtred is far from safe. Beyond the walls of his impregnable fortress, a battle for power rages. To the south, King Æthelstan has unified the three kingdoms of Wessex, Mercia and East Anglia – and now eyes a bigger prize.