Point of Honour
Interesting story about a woman in a world quite like ours but a little different which the author explains in a postscript. Sarah ran away with her brother's fencing master, when he dies she returns to London to live. Her aunt runs a brothel and Sarah finds space in a property she owns on the site of the brothel and sets herself up as an Enquiry Agent. She's comissioned to find a fan that hides a secret that could take down the government abut the bodies start piliing up.
