"Ransomware attacks on hydroelectric dams in the US. The power grid disrupted. Downstream communities flooded. Who are these mystery hackers? The hackers operate in cyberspace, their messages and the ransom money bouncing between countries until their trail disappears off the grid in Eastern Europe. As National Defense Agency operative KD Thorne and her partner Jeffery Blunt track the hackers from dam to dam across the US, the hackers create a web of misinformation to conceal their identities and hide their stolen money."