I haven't read them yet, but they are on my To Read List: The Jack Reacher books by Lee Childs.
I'm reading Tana French's Murder Squad series now and she can really write! But I've only read the first one (In The Woods) and I would only recommend it if you don't mind a book that ends on a fairly depressing, unfinished note. If that doesn't bother you - I can't recommend it highly enough.
For a (very) light fluffy read - I suggest Harlen Coben's Myron Bolitar series. They are what I call "beach reads": not particularly well-written or believable, and can be somewhat repetitive, but they are like potato chips: I just can't stop consuming them. They are just fun - he writes some good dialogue.
2" from being an excellent tennis player!