"A thriller"-- Jacket cover.

"When Western intelligence services recognize that a global jihadist attack has been initiated, the United States and the United Kingdom―its primary targets―lead a desperate counteroffensive. Sally Hanning, a brilliant British MI5 agent, is assigned to assist the CIA task force. She must help them hunt down the enemy mastermind along an intricately disguised online trail. To do so, she entails the services of Jack Irvine, a guilt-burdened NSA code cracker, using enticements both personal and professional. Though they foil the terrorists' plans, the mastermind seems to elude the MI5 and the CIA every time. And as Sally and Jack prepare to head off a major, potentially devastating attack, they realize that the plot is far more sinister than they had ever thought possible."--Dust jacket.