Grandville
"Two hundred years ago, Britain lost the Napoleonic War and fell under the thumb of French domination. Gaining independence after decades of civil disobedience and anarchist bombings, the Socialist Republic of Britain is now a small, unimportant backwater connected by a railway bridge, steam-powered dirigible, and mutual suspicion to France. When a British diplomat's murder is made to look like suicide, ferocious Detective-Inspector LeBrock of Scotland Yard stalks a ruthless murder squad through the heart of a Belle Epoque Paris, the center of the greatest empire in a world of steam-driven hansom cabs, automatons, and flying machines. LeBrock's relentless quest can lead only to death, truth . . . or war" -- from publisher's web site.