Ballistic (Gray Man 3) by Mark Greaney
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After Court Gentry was betrayed by his compatriots and forced to take on a near-suicidal covert mission by the CIA, he thought he could find refuge living in the Amazon rain forest. But his bloody past finds him when a vengeful Russian crime lord forces him to go on the run once again. Court makes his way to one of the only men in the world he can trust -- and arrives too late. His friend is dead and buried.
Years before, Eddie Gamboa had saved Court's life. Now, Eddie has been murdered by the notorious Mexican drug cartel he fought to take down. And Court soon finds himself drawn into a war he never wanted. But in this war, there are no sides -- only survivors.