Shanghai, a night of torrential rain, an old bookstore.
Lu Chen found a set of symbols in a fragment of an old manuscript: three concentric circles, each with a hole at its center. They were exactly like the image he had seen as he teetered on the brink of death.
Following the symbols, he met Lin Zhiyao, a quantum physicist, and a young man in a psychiatric ward who could recite the first twenty digits of pi. The three of them discovered that the city's drainage system, abandoned air-raid shelters, and doodles on medical records all formed the same map.
At the end of the map was October 4, 1957. On the night the Soviet satellite was launched, an observatory recorded a forty-seven-second electromagnetic anomaly. The duty log contained just one line: Instrument calibration error.
Someone knows the truth. Someone is pretending not to.
And Lu Chen has just discovered that someone has tampered with his memories, too.
When the memory takes shape for the third time, the disk will no longer remain silent. The jailer has been among them all along.
