While Pike Logan and Jennifer Cahill prepare to join their team on a counter-terrorist mission in the triple frontier --- the lawless tri-border region where Argentina, Brazil and Paraguay meet --- they are targeted in Charleston, South Carolina. A vicious explosion kills a friend, and the perpetrators have set it up to look like an accident. While the authorities believe this was not foul play, Pike knows the attack was meant for him. When he loses contact with the team in South America, Pike is convinced that he and the Taskforce are under assault. Pike and Jennifer head to Brazil to investigate their disappearance and run headlong into a crew of Russian assassins. Within days they are entangled in a byzantine scheme involving Brazilian politics and a cut-throat battle for control of offshore oil fields.