England 1422: Owen Tudor, a Welsh servant, waits in Windsor Castle to meet his new mistress, the beautiful and lonely Queen Catherine of Valois, widow of the warrior king, Henry V. Her infant son is crowned King of England and France, and while the country simmers on the brink of civil war, Owen becomes her protector. They fall in love, risking Owen's life and Queen Catherine's reputation-but how do they found the dynasty which changes British history - the Tudors?