In incidents dubbed "The Havana Syndrome," U.S. government personnel around the globe are being struck down by sudden bursts of intense pressure and noises reverberating in their heads. Suspicion grows that the Russians are behind the episodes but a Russian mole dupes U.S. Intelligence Agencies into downplaying the outbreaks.The FBI deploys cybersleuth Will Manningham to investigate a Havana Syndrome event in Palermo. His wife, Sally, comes with him as cover, but the trip threatens to tear their marriage apart when Will becomes infatuated with a mysterious beauty they encounter in their travels. Unknown to Will, the woman is a Russian defector sent by the CIA to seduce a Russian kleptocrat suspected of being behind the attacks.Will intercepts Russian communiques and is stunned to learn that the Americans injured in Havana Syndrome episodes were cannon fodder for tests of a deadly new cyber weapon. The Russians are primed to the conquer the Western Democracies by bombarding North America and Europe with intense radiofrequency waves from outer space.Mingling with naval officers from a Russian submarine at a Bunga Bunga party, the voluptuous CIA agent discovers that an attack is imminent. She alerts Will, but her identity is exposed and Russian mercenaries hunt her down. Overcoming suspicions about the woman's relationship with Will, Sally teams up with the agent in a firefight for their lives.Working feverishly, Will improvises a potential counter-program, but he is too late to stop the submarine from launching missiles carrying the deadly weapons into orbit. The West prepares to retaliate against the Russians with weapons of mass destruction if Will's makeshift approach fails. As American and European leaders watch via satellite images, the first missile bursts up through the waters of the Mediterranean.