After reading The Travelers I went hunting for more by Chris Pavone, and The Expats, which I believe is the book that started his career, was pretty darn good.
Want to read it yourself? Get from Amazon:
Lots of characters, but not so many that they’re confusing Ludlum-style, and lots of tension, make for a great, and unconventional, (the spy is a magazine writer! In modern times!), spy novel. I hear Chris Pavone has written a couple of other novels – I’m going to have to seek them out.