A private detective working in Wilmington, North Carolina, is found dead in a gas station restroom. When her body sets off radiation alarms in the pathologist’s office, suspicion falls on the nearby Helios nuclear power plant. The most vulnerable part of Helios is its “moonpool”— the radioactive storage pond that cools spent but volatile reactor fuel, and must be kept completely full...

As the FBI, local police, and the power plant’s own security team investigate, ex-cop Cam Richter begins his own inquiries. What was this detective investigating—and how could she have been poisoned by radiation without others being exposed? Cam soon discovers an inside threat, a plan to use the plant’s own systems to begin an unstoppable, disastrous sequence of events. And time is already running out…