It's 1885 and NOT the London we'd expect to find. Clouds of acidic fog fill the air and body-melting rain could fall at any time, while the Thames is perpetually aflame. Anyone who sets foot outdoors without the proper protective gear is either mad or suicidal. To make matters worse, the world at large is restless: nothing has been seen or heard from within the borders of Germany for several years, the Mediterranean is plagued by the pirate airships of the Corsair Queens, and foreign plots to take control of the British Empire abound.
It will take a particular type of woman to save the day. Or rather, pair of women.