In the era of steam echo, the ether crystal mine supported the fragile peace between the two powerful countries. A murder case in a diplomat's secret room broke the superficial peace.
Internal affairs agent Lu Zhou has the ability to read the reverberations of objects in the past. He saw through the disguise of the murder at a glance, but was suppressed by his superior bureaucracy and was forced to pursue the investigation alone.
He had many life-or-death encounters with the Western Region's ace agent Black Kite, and went deep into the spy network. He discovered that there was a high-level treasonous conspiracy behind the case, and even involved the mysterious organization "Ouroboros."
Lu Zhou used the reverberation as a blade to break the chess game with his wits, slapped the bureaucrats in the face, and outsmarted the spies. When the war was about to break out, he turned the world around alone, but he was shocked to realize that all this was just the beginning of a bigger chess game!
