What is the author's tone in The Six Wives of Henry VIII by Alison Weir?

In many works of historical non-fiction, particularly when there's relatively little source material for the author to analyze, there is the sense that while it's generally possible to have a clear understanding of what happened, it's less possible to understand why it happened. This gives most books of the genre an overall tone of combined objectivity and subjectivity—the "what" is objectively presented, the "why" can often be more subjective. There is the sense throughout The Six Wives, however, that the author has gone to considerable lengths to present the "whys" of the book in as objective a way as possible, supporting her contentions and theories with historical documentation and thoroughly reasoned analysis. In other words, she takes matters of record and extrapolates what into why, developing objective presentations of what might normally be subjective interpretations.