(I received a free copy of this book in exchange for an honest review.)
Lady is a historical fiction novel about Rosalynde, a too-tall, too-strong woman on whom femininity has never sat comfortably. She's secretly trained in the sword from a young age, and when her husband is bed-bound with a mysterious illness just as neighboring lords start sniffing around his lands, she finally finds a reason to put her skills to use. Meanwhile, she's also grappling with infertility and interpersonal conflicts within the castle, most notably with her husband's lover, Robert, who is jealous of her, and with her cousin/lady-in-waiting, who disapproves of her knightly disguise.
The narrative is slow-paced and can at times feel a bit circular: Rosalynde fights off an encroachment from the neighboring lord, frets about her infertility, has tense interactions with her dying husband, argues with Robert and her cousin, then it all repeats. But she is an engaging heroine, and anyone who becomes sufficiently invested in her well-being will find the book compelling nonetheless.
The author clearly has some interest in approaching Rosalynde's gender-nonconformity and chafing against patriarchal oppression in a period-appropriate way, which I appreciated. Reasonably for her time and place, she largely frames things in terms of her Christian faith, and looks to Joan of Arc and various female saints as role models and as evidence that her actions and desires are not truly wrong or harmful. However, modern frameworks did slip in occasionally--there's a reference to "being outed" (vis-a-vis her crossdressing) and a number of references to "women's agency", and those felt quite anachronistic as ways for this character to conceptualize her experiences.
But these are ultimately minor quibbles, and the book is otherwise a solid character study of a woman struggling to find happiness in a society that has boxed her into an ill-fitting role.