This book reminded me of Steve Berry's books: historical thrillers with heavy reliance on research and factual timelines. In addition to being well written and researched, the book read like a top ten thriller by the best authors of today. Lloyd gave just enough flavor in the dialogue to being to mind the quaintness of Old English without bogging us down in too much vernacular. The pacing is brisk and the young hero ernest and likeable. All around excellent work.

2.5 stars

**This book was provided to me by the publisher via NetGalley in exchange for a fair and honest review.**

A detailed, methodical historical thriller for fans who wanted more ‘whodunnit’ in their Hilary Mantel.

There’s a lot to like in this book, particularly for those who love highly-researched historical fiction. Lloyd takes great care with his depiction of late-17th-century life, and he pays particular attention to the scientific thought and advances of that time period, which is fascinating. The post-civil-war politics of 17th century England are also integral to the plot, which will delight readers of more conventional historical fiction. The attention to details—names, places, and inventions of the time period—is meticulous.

As a thriller, however, the book is lackluster. The premise—young boys found drained completely of their blood—is great. However, the big mystery (how exactly the blood was drained) is solved almost immediately, so from there on it’s just a matter of figuring out who killed the boys and why, which is somewhat more usual of a puzzle. There are still plenty of twists and turns, but few that a reader can track or attempt to anticipate, which creates a much more passive experience than thrillers usually evoke; even moments of danger feel rather distant.

That lack of urgency is in part because our hero, Harry, is the biggest disappointment of the book. The Observator of the Royal Society, Harry is supposed to be the precursor to a modern crime-scene investigator, someone who can piece together the evidence to understand not only what happened but why and how. The problem is, Harry has no real personality. He has no real ambition, no real personal history, no real vices or foils, no real virtues. He’s quiet, he’s hardworking, he’s curious… but mainly he’s just kind of there. Harry is like an obliging doll for the author to move through his detailed scale model of 1678’s London, but he is in no way a compelling character, and as a reader I never feel anxiety or worry on his behalf. He’s just tough to care about.

In sum, this is an ambitious historical novel about the science and politics of late-18th-century London, burdened by a bland main character and a rather slow and stumbling mystery plot. The set pieces and side characters are wonderful, but the story itself does not compel.