When Western intelligence services recognize a global jihadist attack has been mounted, the United States and the UK--its primary targets--lead the counter-offensive. Sally Hanning, a brilliant British MI5 agent whose parents were massacred in a terrorist ambush, is seconded to the CIA task force to hunt the Iranian mastermind through Al Qaeda's intricately coded use of social media and the Internet. Jack Irvine is NSA's guilt-burdened code-cracker--it...

Hiding his marriage to a Russian intelligence colonel with an awareness that discovery would result in her execution, MI5 field agent Charlie leads a frantic mission to outwit both governments and save his family when their secret is exposed.