Gunfighter Gothic: under Zeppelin Skies

It's 1866. Jill Masters, a merchant's daughter, and Hanna Pak, her servant, have left Boston for the American West. They're on the trail of Dotson Winters, Jill's kidnapped fiancé, a man she doesn't love but has agreed to marry to save her father's business.

Dotson finds them first, and reveals that he has faked his kidnapping to intercept the Colony List, a catalog of secret agents living as servants in the most powerful houses...
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It's 1866. Jill Masters, a merchant's daughter, and Hanna Pak, her servant, have left Boston for the American West. They're on the trail of Dotson Winters, Jill's kidnapped fiancé, a man she doesn't love but has agreed to marry to save her father's business.

Dotson finds them first, and reveals that he has faked his kidnapping to intercept the Colony List, a catalog of secret agents living as servants in the most powerful houses throughout the world. Now, Jill wants him to save her father's business and Hanna wants him to save the lives of those who, like her parents, spent their lives protecting the world in secret. The women chase Dotson across the American West and finally to England, where they have their final showdown in Kraken Moor, and English castle possessed by demons.

Along the way, the two women encounter a time-traveling British spy, kaiju, lizard men, Sun Chasers, Christian vampires, spiteful Confederates, Dixie-loving zombies, nomadic alien robots, werewolves, President Ulysses S. Grant, and the Metronome, beings who live at the end of time, creating powerful weapons for fun.

The greater challenge for Hanna and Jill is reconciling their new arrangement. Hanna wants to be treated as an equal, but Jill is not quite ready to let their old arrangement go. Can the two women work together long enough to accomplish their goals? And what happens to them if they do? In finding themselves, will they lose each other?