I gave this book 4 stars because the protagonist (Marcus Attilius Primus) and I share the same profession - that of being a civil engineer. I was fascinated by the Aqua Augusta, the aqueduct that brought fresh water to people in nine towns around the Bay of Naples including Pompeii.
True, we all at least know what happened in Pompeii due to the eruption of Mount Vesuvius. So at first I was a bit unsure about reading this fictionalized account of one of the most infamous cataclysms in human history. And yes, the novel was a bit of an underwhelming experience save for the Aqua Augusta but almost half of the plot revolves around it, so, 4 stars.