he life of Mary Stuart is one of unparalleled drama and conflict. From the labyrinthine plots laid by the Scottish lords to wrest power for themselves, to the efforts made by Elizabeth's ministers to invalidate Mary's legitimate claim to the English throne, John Guy returns to the archives to explode the myths and correct the inaccuracies that surround this most fascinating monarch. He also explains a central mystery: why Mary would have consented to marry – only three months after the death of her second husband, Lord Darnley – the man who was said to be his killer, the Earl of Bothwell. And, more astonishingly, he solves, through careful re-examination of the Casket Letters, the secret behind Darnley's spectacular assassination at Kirk o'Field. With great pathos, Guy illuminates how the imprisoned Mary's despair led to a reckless plot against Elizabeth – and thus to her own execution.