What was the life of spies like from 1700-1800?

Question

I wanted to make a story out of it, just need some information.

Answer 1

There is an excellent exposition of this topic for the American Revolution at the home of George Washington in Mount Vernon, Virginia. Maybe contact them on their web site to buy a book on their collection, or go there yourself.

Answer 2

Get caught, get hung. On the other hand some existed for years. Decades. It was not simple and it never is.