The discovery changed everything. Now the shadow war begins.David Mercer is in custody. The secret is out. Buried beneath the lunar south pole lies a colossal, engineered anomaly, and every nation on Earth wants control of it. But as the world's powers scramble to draft a fragile joint protocol, Shackleton Base is already breaking apart from within.The water extraction plant fails. The communications relay drops. The reactor coolant shunts cold.Each catastrophe is executed with the seamless precision of an insider, someone who knows every load-bearing system, every structural weakness, every blind spot. Kate Harmon, a coldly brilliant Oversight investigator, is sent from Earth to find them before the base dies around its crew.Working with Nora Reyes, whose frostbitten hand has gone numb to everything except the anomaly's deep, subterranean hum, Kate uncovers a chilling pattern. The sabotage isn't random. Every attack lands at the exact moment the drill reaches a new depth.Someone is watching the descent. And they will murder to stop it.As the trail leads toward the base's most trusted faces, Nora's team prepares to breach the threshold of the anomaly itself. But on the Moon, trust is the rarest resource of all, and in the long shadow of the lunar night, a countdown has already begun.