The Daughter Of Time by Josephine Tey
At Scotland Yard, Inspector Grant has a reputation for being able to pick them at sight. Now he is in hospital, knowing that no amount of good behaviour is going to make this anything less than an extended stay. Yet his professional curiosity is soon aroused. In a portrait of Richard III, the hunchbacked monster of nursery stories and history books, he finds a face that refuses to fit its reputation. But how, after four hundred years, can a bedridden policeman uncover the truth about the murder of the Princes in the Tower?