Jed Walker Number 4.

From Goodreads:

An adrenalin-fuelled action thriller featuring ex-CIA operative Jed Walker.

For Walker, winning is the only option if you want to stay alive!

Jed Walker is ex-CIA – he thought he was out of the game. An ominous global threat brought him back into play. But just when Walker thinks he is winning, the bad guys change it up a gear and the odds get stacked higher against him. In the global theatre of war, winning is the only option if you want to stay alive.

Discovering a terrorist outfit is running people smuggling out of the Middle East, Walker thinks they are driven purely by profit and greed. But it is much worse than that. He must work against time and powerful adversaries to uncover the truth behind the operation and prevent a global catastrophe being unleashed.
If he lives, Jed Walker will learn the true cost of life . . . and the knowledge will change him forever.
Another great book in the series though I think we might not see Jed Walker for awhile. Nice finish to Zodiac story arc but paints a pretty poor image of American greed. Hopefully none of it true.