THE DAUGHTER OF TIME by Josephine Tey

Classic detective fiction, this novel finds Scotland Yard's Inspector Grant bedridden in hospital going a little stir-crazy during his recovery. A friend distracts him with historical portraits and Grant becomes obsessed with a portrait of Richard III in which the face of the famous evil hunchback doesn't quite fit its illustrious reputation. Grant's curiousity leads him to revisit British history and reveal the truth about the murder of the Princes in the Tower of London.