King Richard III, hunchback, last of the Plantegenets, one of Shakespeare’s blackest villains, and long decried as the murderer of Princes in the Tower. But did he really murder his nephews to cement his hold on his throne?
Inspector Grant, confined to a hospital bed, is given a portrait of Richard III, and finds that he cannot believe that this was the face of a cold-blooded villain. Aided by a young historial researcher, he conducts an inquiry from his bed, and makes a convincing case that another was the murderer.
More at the Wikipedia article on The Daughter of Time.