Unnatural Habits is one of the more memorable entries in the series, in that it has a lot of social commentary and some really appalling details which are, as far as I can tell, historically accurate, like the laundry run by nuns, the lying in homes where unmarried women had their babies and they were taken away, white slavery, etc. There’s also some interesting stuff with the Blue Cat Club — a gay club which apparently really existed — and the newspaper office where Polly Kettle, wannabe ace reporter, works. Phryne gets into quite a lot of trouble in this one, and the expanded circle of her minions, including Tinker, stand her in good stead.
The book also has the delightful side plot that someone is going around in a nun’s habit, knocking men out, and very skillfully and carefully operating on them so they can’t have any more children, in cases where they mistreat their wives/children, don’t provide for them, etc, etc. It’s problematic, of course, because it’s an assault, but it’s also just glorious poetic justice in a fictional context, so I don’t feel too bad for laughing about it.
The ending is predictably dramatic, and Phryne predictably kickass in bringing things to a neat conclusion. And I love the glimpses we get beyond her armour in her reaction to the laundries and what she sees in the lying in home.