The Secret Key to the Archives

Deep inside an excavation pit at the Keqiutou Site in Pingtan, Fujian, an archaeological team unearthed something that should not exist: a sequence of images perfectly preserved inside rock, recording an anomaly in the skies above this coast tens of thousands of years ago. Almost at the same time, regular, unnatural signals were detected, and a countdown had quietly begun across the globe.

Humanity soon discovered that Earth was not alone, and had never been ignored. A being calling itself "Lan" had been watching this planet all along, and being watched was itself the prelude to judgment. Humanity had only hours left. Weapons were meaningless here, and there was nowhere to run. An archaeologist, a soldier, and an old man who had spent his life tending a lighthouse became the only bargaining chips in this standoff, because what could make a higher civilization stand down was never strength, but the one thing humanity possessed that it did not.

This is a hard science fiction story about being observed: when the gap between civilizations is so vast that hope seems lost, what can humanity offer to prove it deserves to keep existing?