FBI special agent Lisa Tanchik is skilled at handling cyber threats, having recently taken down a Dark Web black market worth billions. But ruthless hacker NatalyaX always seems to be a step ahead. The government calls on Tanchik’s expertise when an email attachment causes a fatal seizure at US Cyber Command. But before she can get her feet under her, the entire East Coast goes dark. A sinister plan is unfolding before her eyes—and no one knows who’s behind it. Tanchik plunges into chaos to hunt down the true source of the attacks. Close dealings with shadowy figures both online and off expose her to extraordinary danger as the country teeters on the brink of catastrophe. A soldier on the front line of a cyberwar, Tanchik must nullify the threat before it deals a death blow to America’s institutions—and puts millions of lives in jeopardy.