Autumn 1624.

Europe is deeply embroiled in what will become the Thirty Years' War. A young Philip Lord, once favoured at King James' court, has vanished without a trace, under the shadow of treason. Outside the besieged city of Breda, Captain Matthew Rider faces the brutal reality of wintering his cavalry in the siege lines, until he crosses paths with Filippo Schiavono, a young man whose courage and skill could change everything.

Kate, Lady Catherine de Bouqulement, arrives in London prepared to navigate the dangerous politics of King James' court to ensure troops are sent to her mistress, the exiled Queen of Bohemia. Within Breda’s walls, a foundling named Jorrit unwittingly stumbles into a lethal conspiracy when Schiavono hires him, supposedly to help sell smuggled tobacco. But Schiavono’s plans go awry and they are compelled to flee the city, only to be captured at sea. If Schiavono is unable to prove his loyalty and ruthlessness to a savage Dunkirker privateer captain, both he and Jorrit will face certain death.

Meanwhile, in London, Kate is forced to fight her own battle against those seeking to coerce her into their schemes and finds herself trapped in a terrifying and deadly power struggle. Driven by violence, treachery, and the sea's merciless tides, their fates collide.