King Henry V - the great lion of England - is long dead.
In 1437, his pious and gentle son comes of age and takes the throne. Frail in both body and mind, King Henry VI is utterly dependent on his supporters to run his kingdom.
Richard, Duke of York, however, believes that without a strong king England will fall. His fears seem justified as English power comes under threat from France, and discontent and rebellion spread at home.
On the counsel of his advisers, Henry marries the young princess Margaret of Anjou in order to forge an alliance with France - but is it too late?
As the storm clouds gather, King Henry and his queen are besieged abroad and at home. Who can save the throne? Who will save the kingdom?