1364, England.
Ash Barden is now, reluctantly, an earl. Once, he assumed that his brother Raff would handle the business of heirs, but Raff is besotted with their "hostage" Penn, and after years of Raff caring for him after the war in France, Ash cannot ask him to forsake his happiness. Agnes is a Scottish widow, pressured by her family to remarry. While she isn't necessarily interested in a second marriage, she'd rather marry someone of her choice than the family friend whom she hates. When she meets Ash, she's put off by his temper, but drawn to the strangeness of his family and the kinds of promises he makes to her: most importantly that he'll allow her to continue to dress as a man. It seems as though they may have the perfect friendly arrangement, until Oliver, the lover Ash thought long dead, walks unexpectedly back into his life.
This is for the reader who wants every love triangle to resolve in a poly relationship. It's well balanced between the three perspectives of Ash, Agnes, and Olly, and as a reader I felt attuned to each of their internal struggles related to the development of their relationship. There is an overarching plot--Agnes and Ash must get married--and an overarching conflict--someone is trying to prevent that marriage. The focus on the introspective keeps the reader's interest with the quieter plot.
Agnes's internal struggle is the most complex. She would identify as nonbinary in contemporary times, but lacking the vocabulary and framework for discussing nonbinary gender in 14th century English, considers herself "she" some of the time, and simply more comfortable in men's attire and behavior other of the time. She experiences body dysmorphia over the course of the book, and we know Ash and Olly are good for her because they respond to her in different and equally comforting ways.
Ash is the classic romance hero who has pledged his heart to a long lost love and cannot possibly love again. His internal struggle ponders the nature of broken vows, or whether the vows he made with Olly "count" or not. He's loyal and thoughtful and kind to those who deserve it, despite the PTSD he experiences from the war in France.
Olly is the charmer (fitting as the minstrel) of the group. His internal struggle is over abandonment when being held for ransom, but this resolves fairly quickly when he and Ash talk. He also worries about being left out, as the one who hasn't said vows recognized by the Church and in front of more than one witness. He's the first to recognize that Ash and Agnes catch feelings, and the last to realize that he has, too.
I enjoyed the exploration of queer identity and poly relationships in the medieval era. The way Emma Denny sets up the story and engages with social standing and marriage is interesting, and my brain immediately started approaching the story from an academic perspective (gender in medieval Christianity was part of my grad school days), and I found it a little more complicated for me personally to engage with the swoon of the romance. This book heats up significantly in the last third, with plenty of intimate scenes -- explicit and not -- between all parties.
Thank you to Harper 360 for an eARC. A Vow Made Twice is out 1/27/26.