In the darkness of 13th-century Europe, the most precious treasures of the Christian world lie in a small chruch in the great ruined city of Constantinople : the crown of thorns, the spear that pierced Jesus’s side, the shroud bearing the imprint of Christ.
On the other side of the globe, Petroc of Auneford has left his old monastic world for London alongside the enigmatic Capain de Montalhac, purveyor to anyone with sufficient money and desire.
For Petroc, the trip is soon blighted by tragedy, but grief is no guard against greed. The great powers of Christendom are gathering. All covet the power of the most precious relics – and Petroc finds himself right in the eye of the strom.