Hm - how about starting off with books that you have already read in your native language. Might be a tad boring, but you have a book to go back to as well as a basic idea to the context.
Have you tried Douglas Preston, James Rollins, Robert Ludlum? - fairly easy to read books in the adventure / adventure / spy genres.
Oh, and keep reading on the forum - heaps of easy to follow english here.
