The Spy Thriller
The hero/heroine of the story is usually a spy in another country, and working for a sort of intelligence agency. From the beginning, there is a significant crisis or threat that looms above the nation of the agency. This sub-genre would read like a fast, action-packed adventure. This should have you turning the pages at some speed, and barrel rolling towards the climax.
Some knowledge of the politics, religions, finances, wars or status of the second country would be an advantage. Works by Tom Clancy and Robert Ludlum are a few of my favourites.
Not centring on murder or violence is permissible and liked.
This is a challenging market to crack into as it is commanded by John le Carre, who has the substance one would need to make it credible.