tl;dr
A paced-out story with a strong focus on characters that reads a lot like an origin story for further mysteries.

Thoughts
This is an interesting approach for something marketed as a mystery series. Most detective stories dedicate less time to the characters, painting everyone in quick strokes while the plot drives the story along. In this case, it feels like the story unrolled at its own pace while we learned more about the characters. The first third of the book dedicates itself to setting the scene. Characters are introduced, plot points are set up, and we don't get the actual mystery until about a third of the way through. Instead, we get a lot of backstory and some in depth character building that help us learn who Eliza is, and why she is the way she is. It takes another third of the book before Eliza actually starts actively working on the mystery herself, and the mystery takes a bit of a backseat to working through Eliza's feelings and growth. It's got a very origin story vibe that feels like it would cut out at the end to an older Eliza saying "And that's why I decided to become a detective!" The extra time spent with the characters is appreciated. Eliza's uncle is a particular favorite, with his own story arc that feels more thoughtful than the way some mysteries might play it. The secondary lead Dafydd doesn't get nearly as much attention in this volume, but I'm fine with that. If this is to be a series, I expect we'll have plenty of time to learn more about him later. Overall I think this book would land well with readers looking for a paced out, character-focused historical fiction.

Thanks to NetGalley and Duckworth Books for an advance copy! All thoughts in this review are my own.