A Trade of Blood by Robert Jackson Bennett is the next installment in the Ana and Din Mysteries, and it trusts both its characters and its readers to have grown.

The setup draws on the oldest of tensions: two powerful families on the verge of all-out war, a murder that may or may not be what it appears, and an impossible task handed to the one pair capable of unraveling it.

Bennett adds more, though, and what he adds makes for a much richer and more enjoyable read. Familial conflict is only the beginning. Underneath it is a deeper examination of how family shapes everything — the demands and expectations of loyalty, wounds both visible and invisible, and all the emotions that don't have clean names — for an individual, and perhaps for an empire.

Din is a more seasoned and mature investigator than we met at the start of The Tainted Cup. His growth has been one of the quiet pleasures of this series, and here it carries both a cost and a gift. Experience changes how he sees the world, and Bennett gives real weight to what that means for his engraver ability and his sense of self.

Through Din's eyes, we also see more of Ana than we have before. She remains utterly singular, and this book offers new dimensions to her character. There are threads here I am still turning over, and I find myself hoping Bennett continues to pull on them.

The book's exploration of farming practices, food systems, and the industry and expectations of empire adds a layer I didn't expect to find as compelling as I did. It recalled for me the feeling of first reading The Jungle and Silent Spring, though in a world entirely its own. This is the type of world building I enjoy most as a reader. It is intentional, structural, and has been quietly enhancing the story since The Tainted Cup.

A Trade of Blood is a more interior book than its predecessors, which suits exactly where Din is as a person. This world and these characters are worth the three-book investment, and with each new story, there is always more to discover.