I don’t get on well with Philippa Gregory’s fiction, so I’m not terribly surprised that I wasn’t a great fan of this either. I do like David Baldwin’s work, though I think I’ve already read a full biography of Elizabeth Woodville by him; Michael Jones’ work here is strong enough and based solidly enough on actual research to intrigue me.
I actually quite liked Gregory’s introduction, ridiculously long as it is. She does actually raise valid points about the writers of history, and about how historical fiction and historical fact interact. I can at least relate to her powerful interest in the subject. On the other hand, there’s very little actually known about Jacquetta, the biography she writes, and it reads very much like the fiction books she’s already written, stripped of dialogue and sprinkled with “maybe”.
Overall, I can see this being interesting to people casually interested in the period, with enough experience of non-fiction not to complain too much about the equivocal statements (guys, if they stuck to the facts we know for absolute certain, we could say they were born, married, had children, and died — often, that’s about it; if we presented speculation as fact, that would be rather dishonest and not helpful at all to the field). I can’t really recommend it for people who’ve already delved into non-fiction on the period: this doesn’t offer much of anything new.