Line Of Fire. The Nate Thrower Series, #5

Thrower's in New York for a personal situation, but soon discovers he'd rather be just about anywhere else. Thankfully for him, a job comes calling. But not just any job. This might be the biggest one he's ever had. Protecting the President of Chile. President Carla Suaza is dealing with an imminent threat, though no one is sure whether it's coming from inside or outside her own administration. Nobody can be trusted.
That's where Thrower comes in. He's to keep her safe until the threat is identified and eliminated. at any cost.