In the author's note at the conclusion of the book, Hickson describes how she came up with the idea for the novel-- it was supposed to be set in the Tower, and act as a biography of Joan Vaux. The one thing Hickson didn't immediately have, she says, was a plot.
And, frustratingly, despite 450 pages and 16 years of narrative, no plot materialises. There are a few vague through-lines, such as Joan's bizarre love of the ravens, or the general unrest during the early years of Henry VII's reign, but nothing that actually counts as a plot. If fiction is about a character wanting something while something stands in their way, in this case it's entirely unclear what Joan wants and what's in her way. Rather, the book meanders through a series of events, both historical and personal, all of which seem briefly exciting, only to be all too easily solved and dismissed within a few sentences.
Other than plot, my biggest frustration with this novel was its constant use of anachronisms. Characters constantly use modern slang, such as "super intelligent" or "doing a recce." Perhaps this was intended to make the characters sound relatable, but considering how they adopt more Renaissance-speak elsewhere (with plenty of "my lady" and "break your fast") the slang simply pulled me out of the novel.
More serious than the language, however, is the attitudes of the characters, particularly Joan. For no real reason at all, she has a fear of childbearing that leads her to resist marriage. This sort of attitude, while it's one that I can definitely understand today, seems totally out of place in the period. Perhaps it could have worked if Hickson had given Joan more of a reason for feeling how she does, but, as it stands, it just reads like a modern mindset has been transplanted into a historical woman's brain. (Also, while Joan seems so concerned about childbirth that she's willing to forgo the advanced status that would come with marriage, as soon as she gets past the "traumatic" birth of her first child, she's eager to have another one, making all her previous fears seem trivial.)
Despite these significant issues, there are aspects of the novel that are commendable. Hickson certainly does know her history, and, despite how the novel is frustratingly full of info-dumps, there's a lot here to delight the lover of historical fiction. Joan is a fascinating character, and it's enjoyable to learn more about such a little-known historical figure. I didn't enjoy this book as a novel, but as a fictionalised biography, it's worth a read.