A 19th-Century London Civil Servant, But His Boss Is an Evil God

The title is tentative. The current one sounds too much like a light novel, but I can't think of anything else right now, so ignore the title. Here's the blurb:

[I transmigrated to 19th-century London, England, and became a civil servant with a promising future.

My boss is the renowned Queen Victoria. The British Empire basks in her glory at the height of its power. As the prime minister's secretary, I hear everything, from the movements of European nations to strange happenings in back alleys. Nothing in the empire escapes my ears.

Sounds impressive, doesn't it?

But that's because my boss, Queen Victoria, is really named Gloriana, and she's an Outer God from beyond the cosmos. Seven hundred years ago, she and her kind defeated us in a war and took over the Earth. Since that day, we've lived under a blood moon as servants of the gods.

I believe that every sane, rational person who transmigrates should become an investigator and do their best to drive these tentacled, evil Outer Gods off the Earth.

Unfortunately, by the time I finally climbed the ranks to become the prime minister's secretary and was granted my first audience with the queen, I realized in terror that my boss wasn't human. It was already too late.

...I became a traitor to humanity, the enemy of every investigator, a lackey of the Outer Gods, the shadow of 10 Downing Street, and the executor of the queen's will throughout the United Kingdom of Great Britain and Ireland and its other territories and dependencies.

Sorry, there may not be room for all of you here.

I'm joking.

Today is the first day of my betrayal of humanity. If I somehow manage to survive a month, I hope I'll still feel like joking then.]

Excerpt from Chapter One of The Great Victory: A Biography of Ewan Young.

Reader's Guide:

The male protagonist has no romantic pairing, and the story is told in third person.

This is Western alternate history fanfiction based on the setting of Neil Gaiman's short story A Study in Emerald. It takes plenty of liberties with real history and includes a little crossover with classic works like Sherlock Holmes, but not much, so it can be read as an original story.

Theme: Tentative