December 1460. The vicious struggle for the crown of England, known to history as the Wars of the Roses, remains unresolved. Sir John Mandeville delights his young wife with the gift of a book of hours. Soon she is dead, murdered by men desperate to retrieve a secret letter hidden in the book.As an uneasy truce fractures into the bloody endgame of the Yorkist coup, Mandeville follows the trail of the mysterious Kemp, who led the attack. The glamorous spy, Francesca Nori, and her mentor Coppini, the papal nuncio, both want to help him, but whose side are they really on?And as the spiral of violence leads inexorably towards the holocaust of Towton Field the shocking truth of the letter's contents will be revealed, and Mandeville will find himself at the centre of a web of intrigue which reaches far beyond the shores of England.