The Daughter of Time by Josephine Tey

Richard III reigned for only two years, and for centuries he was villified as the hunch-backed wicked uncle, murderer of the princes in the Tower. Josephine Tey's novel The Daughter of Time is an investigation into the real facts behind the last Plantagenet king's reign, and an attempt to right what many believe to be the terrible injustice done to him by the Tudor dynasty. Inspector Alan Grant of Scotland Yard, recuperating from a broken leg, becomes fascinated with a contemporary portrait of Richard III that bears no resemblance to the Wicked Uncle of history. Could such a sensitive, noble face actually belong to one of the world's most heinous villains - a venomous hunchback who may have killed his brother's children to make his crown secure? Or could Richard have been the victim, turned into a monster by the the Tudors? Grant determines to find out once and for all, with the help of the British Museum and an American scholar, what kind of man Richard III really was and who killed the Princes in the Tower.

The Kingmaker’s Daughter by Philippa Gregory

Anne Neville and her sister Isabel are daughters of the most powerful magnate in 15th century England. Ever ruthless, always plotting, in the absence of a son and heir, Warwick sets about using his daughters as pawns in his political games. Anne grows from a delightful child brought up at the court of Edward IV and his queen, Elizabeth Woodville, intimacy and friendship with the family of Richard, Duke of Gloucester. Her life is overturned when her father turns on his former allies, escapes England and invades with an enemy army. Widowed at 14, fatherless, with her mother locked in sanctuary, and her sister a vengeful enemy, Anne faces the world alone. But fortune's wheel turns once again. Anne plots her escape from her sister's house, finds herself a husband in the handsome young Duke of Gloucester, and marries without permission, in secret. But danger still follows her. She finds that she has a mortal enemy in the most beautiful queen in England. Anne has to protect herself and her precious only son from the treacherous royal court, the deadly royal rival, and even from the driving ambition of her husband - Richard III.