In a Gilded Cage by Rhys Bowen is the 8th book of the Molly Murphy historical mystery series set in early 20th century New York City. Primary topic of the mystery: early 20th century women were "caged" (restricted) by their fathers, then husbands. Supposedly for their protection; actually to satisfy power/control personalities (worst case) or bred-in chauvinism (best case).
Spunky Molly befriends a group of Vassar women marching for suffrage. "We can do anything a man can, except vote. Half the population has no voice. Women, demand to be heard! Take your rightful place in society."
Molly notes how her new friends' opportunities in life, expanded by college, severely contracted when they married. She's not of their "high society" class, but has more freedom and independence.
"What will it take for men to see that we are as capable as they are of rational thought?"
"If we marry, Daniel, you are not going to lay down the law. It is not going to be your household. It will be our household, our family. We will run it jointly or not at all. You will never walk all over me."
Did women have to surrender their wits and their power when they married?
"It is my observation that most husbands do not want brainy wives. They want an adornment, a good mother but not one who will provide any threat to their authority."
Her neighbors Sid and Gus provide a fine example of female independence. My neighbors Elena Goldfarb and Augusta Wolcott, usually known by their nicknames Sid and Gus, never failed to bring joy into my life. They were generous to a fault and always experimenting with new foods and cultural experiences, making each visit to their home an adventure.
A humorous minor theme is the resistance by most folks at the time to modern innovation. I watched him working furiously to crank that machine to life. "You should stick to horses, they're easier to start." "This is an experiment. The commissioner of police wants to find out if automobiles might be useful in police work. So far I'm not impressed."
Molly gladly accepts inquiry jobs from her new Vassar friends: find out the truth about Emily's parents; find out if Fanny's husband is having an affair. Research takes her into the MA countryside. These sweeping green hills and racing brooks reminded me of home. When an April shower peppered the train window the picture was complete. I was so used to the sooty city air of New York that it was delightful just to breathe here. [Williamstown MA]
So it was back to the station and another train ride. I'm sure those who do not make their living as detectives have no appreciation for the amount of time we take coming and going. The job turns out to be hours of travel, hours of nothing happening, coupled with the odd minute of excitement every now and then.
When her newfound friends begin dying, Molly puts on hold her original inquiry jobs, to investigate what she is very sure must be serial murder. Police and doctors brush off the deaths as the natural course of illness. Molly attempts to determine systematically (by process of elimination as the deaths occur) what all deaths have in common. As must be the case in many real-life investigations, she doesn't arrive at the correct answer right away; more die. Once she knows the true cause of death, she ferrets out the motivation to kill. Of course she ends up in a confrontation with the killer.