In the resource-depleted and forgotten bottom colony star "Rust Valley", the scavenger Cohen accidentally dug out a cipher text from a scrapped deep space probe that did not belong to any known civilization. Only he can decipher the cipher text, and the content points to a coordinate that has been officially declared to "not exist" - the core area. In order to obtain a legal identity and treatment qualifications for his seriously ill sister, Cohen sold the cipher text to a black market intelligence dealer. However, overnight he was hunted by the security department in the core area, besieged by local gangs, and watched silently by a mysterious "recovery team." While on the run, Cohen discovered that his ability to crack ciphertext was no accident - there was a gap in his memory that was artificially implanted. He must find the hidden passage leading to the core area in the deepest part of the ruins of Rust Valley. At the same time, a core area inspector who lost his partner quietly arrived in Rust Valley. The defecting scientist she was tracking pointed to the same person as the blank in Cohen's mind.
