28 January 1457. England is in the grip of the Wars of the Roses. Inside the walls of Pembroke Castle a thirteen-year-old girl gives birth to a boy. The ordeal nearly kills them both, forging a powerful bond that will see mother and son work together to found the most famous dynasty in British history: the Tudors.
As the battle for royal supremacy raged between the houses of Lancaster and York, Margaret Beaufort was forced to be separated from her son for fourteen years. Surrounded by conspiracies in the enemy Yorkist court, Margaret remained steadfast, only just escaping the headsman's axe as she plotted to overthrow Richard III and secure her son on the throne. Against all odds, in 1485 Henry Tudor was victorious on the battlefield at Bosworth, and Margaret saw her son crowned King Henry VII, while she became the most powerful woman in England, Queen in all but name.