A full length biography of the extraordinary love affair between John of Gaunt and Katherine Swynford. Katherine was renowned for her beauty and regarded as enigmatic, intriguing and even dangerous by some of her contemporaries. Weir has rescued Katherine from the footnotes of history, highlighting her key dynastic position within the English monarchy. Weirs last non-fiction book Isabella: She-Wolf Of England, Queen Of France, sold 41,000 copies, and her first novel, Innocent Traitor, sold over 33,600 copies.