February, 1460: in the bitter dawn of a winter's morning a young nun is caught outside her priory walls by a corrupt knight and his vicious retinue.
In the fight that follows, she is rescued by a young monk and the knight is defeated. But the consequences are far-reaching, and Thomas and Katherine are expelled from their religious Orders and forced to flee across a land caught in the throes of one of the most savage and bloody civil wars in history: the Wars of the Roses.
Their flight will take them across the Narrow Sea to Calais where Thomas picks up his warbow, and trains alongside the Yorkist forces. Katherine, now dressed as a man, hones her talents for observation and healing both on and off the fields of battle. And all around them, friends and enemies fight and die as the future Yorkist monarch, Edward, Earl of March, and his adviser the Earl of Warwick, later to become known as the Kingmaker, prepare to do bloody battle.
Encompassing the battles of Northampton, Mortimer's Cross and finally the great slaughter of Towton, this is war as experienced not by the highborn nobles of the land but by ordinary men and women who do their best just to stay alive.