‘Memento Mori’ (2018) by Ruth Downie

Good Reads meta-data is 432 pages, rated 4.2 by 430 litizens.
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Verdict: All hail.
Gaius Petreuis Ruso, Roman legionnaire retired, and his wife Tilla, tribal Britain, are at it again. No, not that. They uproot themselves from the farm in the North of Britain, where Ruso is trying to fit in with the Britains, though he draws the line at tree hugging and singing to carrots, when his old army buddy sends for help. Ruso is only too glad to have an excuse to leave the farm.
Tilla, as usual surprises him, by declaring that she will go along, too, with their infant daughter, nursemaid, hapless slave Eisco, and the exhausted messenger Albanus. This troupe sets off down river, over hill, pass dale, and through mud, through more mud — this is after all England — to arrive at Bath, well it must be but it is not named in the book. Instead of the heroic mercy dash Ruso had imagined, it is a slow plod.
Someone has murdered Serena, buddy Valens’s estranged wife, and he is about to be tried for the crime. He says he is innocent, but Valens has had so little experience in the telling the truth that Ruso is not quite sure whether to believe him. Serena’s father demands justice, and he has lots of large friends who also once served in the legions to back up his call. By the time Ruso and company arrive, Valens is pretty well convicted.
But Ruso never knows when to quit and he asks questions to find that the local priests at the baths squirm this way and that. A trial they do not want. Too public. Too open. But why are they so worried? What are they hiding? How can they hide anything when bathing?
As usual those who know do not say, and those who do not know will not shut up. Sounds like a committee of PhDs at it.
Ruso stumbles around irritating everyone, and exhausting himself. Tilla adds her efforts with little success. There is a large cast of red herrings for each of them to consider. During the consideration we learn a lot about life in Roman Britain, and how holy baths work, including some water engineering. Too bad the British lost the knowledge of bathing when the Romans left.
This is the eighth title in the series and it maintains the standard of excellence. Ruso is so ordinary and Tilla tries so hard. Together they are charming and refreshing compared to the leads in many historical krimis.