Suggestions for a spy historical fiction novel set in the 1800s published in the last 5 years or so?

I'd love your help to find a spy historical fiction novel set in the 1800s published in the last 5 years or so?

• The protagonist does not have to be a professional spy; they can be a regular person whose circumstances lead them to spy in order to survive.
• If the story takes place a little bit before or after the 1800s, that's okay.
• Bonus points if there's some adventure mixed in, and if it takes place in India.

Thanks for your time!!