Ideas

I want to write a book that has steampunk elements and a mystery.
The main character should be female and the story should be Victorian.

 Main Character
A secretary in an organization.
A rich young lady.
A resourceful young woman.
An undercover agent for another organization who is stealing company secrets.
A group of young women who are tired of being taken advantage of.

Mystery
Someone dies
A series of murders (serial killer)
Theft?

Motivation
The main character is suspected of the murder.
The main character(s) wants justice.