It is seven years since the Cousins' War ended. King Roald has brought peace to the Three Kingdoms and driven the last heirs of the king he deposed into exile. His brother Thomas, Duke of Wharram, is a man for whom loyalty is the greatest virtue and family the highest cause. So when his sister Josiane, Duchess of Bergomance, finds herself widowed, her beloved stepdaughter Ambrosia beleaguered by suitors and her late husband's coffers mysteriously empty, who better to send than Thomas?
But the ghosts of old wars are waiting in Bergomance, and new threats are rising. Some see heresy everywhere, and others look to an Empire in the east that has suddenly begun seeking allies.
And into it all, a ship driven off course by storms brings a young man fleeing King Roald's mercenaries and throws him into Thomas's path. Nicolas ás Ithel, a man with dark eyes and a love of numbers, and an inheritance in his veins that could reignite the Cousins' War.