That sounds like an interesting book idea. Here are two possible crimes that could have happened in a world similar to ours from 200 years ago:

- A mysterious murder at a masquerade ball, where the victim is found stabbed in the back with a letter opener. The detectives have to interview the guests and find out who had a motive and opportunity to kill the victim, while also dealing with the social and political intrigues of the high society.
- A daring heist at a bank, where a group of robbers manage to break into the vault and escape with a large amount of gold. The detectives have to track down the clues and follow the trail of the robbers, while also facing the corruption and violence of the criminal underworld.

Which one do you like more? Or do you have another idea in mind?
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