As a very committed Ricardian of some 40+ years, it was very refreshing to read a book about Richard that concentrated on facts and actual documentation, rather than opinions of various commentators who were not privy to such information.
The hypothesis about the reason for Hastings execution being the concealment of his knowledge of the pre-contract from Richard rather than a plot with the Woodvilles (who were Hastings' opponents), certainly seems to me a more realistic reason for the event, especially when you consider the rewards showered upon Catesby who revealed Hastings' deception to Richard. Richard's fierce anger at Hastings' betrayal (something Richard abhorred, as his enduring loyalty to his brother shows) makes sense, and I agree with the author that when he calmed down he regretted his action, bearing in mind his generous treatment of Hastings' widow.
The book is put together very well with very little speculation about events, rather relying on factual provable information. I enjoyed it very much, and highly recommend it to students of this historical period, whether Ricardians or not.