Former US Ambassador to the Ukraine Douglas Flannery meets with an old friend and former spy near New York's South Street Seaport. She is seeking his help to thwart a Russian plan to overrun her native Ukraine, but those for whom she is working propose an infinitely more dangerous scheme, one that could draw in NATO forces and possibly ignite World War III. Moments later, as she jogs along the East River, her throat is slashed.Within hours, Op-Center learns of the killing and alarm bells go off. Director Chase Williams and his team have been following events as both Ukraine, her NATO allies, and Russia rapidly deploy forces in a dangerous game of brinksmanship. But the secret that Flannery has learned threatens to take the looming battle to a whole new and very lethal level. Using cutting edge techniques of cyber warfare and spycraft, Op-Center must respond to the rapidly unfolding crisis before the U.S. is forced to take sides in a conflict that could change history.

ISIS reigns supreme in huge swathes of Iraq and Syria and poses a threat to stability in the Middle East. When an American airstrike kills the ISIS leader's only son, he vows revenge. He discovers that a U.S. Navy admiral, now on duty in the Pentagon, led the strike. The ISIS leader has him kidnapped by American home-grown ISIS sympathizers. Their orders: smuggle him out of the United States and bring him to Mosul for execution.When the normal levers of U.S. domestic security can't move quickly enough to locate the hostage, the President calls on the National Crisis Management Center-Op-Center to find the admiral and rescue him. But as the crisis drags on and it appears the admiral is hidden in a cargo shipment, already on a flight out of the country en route to Mosul, his son, a Navy SEAL, embarks on a lone-wolf mission to rescue his father.Op-Center must muster both its domestic strike force, an elite component of the FBI's Critical Incident Response Group...