This is a valuable book that focuses on Mary Stuart as a ruler rather than Mary Stuart as a heroine in a historical romance. It is not a mystery about who killed Lord Darnley. It is a critical analysis of what occurred when someone who was historically ordained to rule, but who possessed none of the qualities to make that rule successful in the dynamic of the sixteenth century, attempted to lead Scotland through the religious and political minefiled of its pre-modern politics. Some writers tend to think that Wormald is too tough on the historical Mary Queen of Scots, but there is good basis for her analysis. The essential question about the Scots Queen in not really whether or not she wrote all or some of the Casket Letters, and whether or not she was a player in the murder of her husband Lord Darnley, but whether she faired any better than most of the other Stuart kings who followed her in dealing with the great issues of her day. She clearly did not. While my own review of the letters insofar as they presently exist, the evidence from a variety of sources, and my own experience as a successful prosecutor leads me to believe that I probably could convict her of conspiracy to commit murder , but not as an aider and abettor of murder itself, if she had been less a French queen and more a Scot, had she seen her role more as an obligation to her own historical niche and less a license to behave as if she were answerable to no mortal, her monarchy might have ended quite differently. No one would have cared about Darnley. Anne Boleyn and Katherine Howard, and even Thomas More did not put an end to Henry VIII, Essex did not end Elizabeth I, and the disposal of an unpopular sometimes Papist consort, would not have ended Mary's rule. Her prolonged absence from Scotland during her childhood, her identity with powers that were not in step with the religious and political changes in Scotland, her reliance upon her half-brother and other men to lead her country and usurp her power to make decisions are among teh flaws that are exposed and highlighted in this short but important book.