In a future where most of civilization has been wiped out by the "Great Silence", the surviving giant city "Asselburg" is the last barrier of mankind. The city is divided by an invisible wall. The upper level is the gleaming sky dome area controlled by the super-corporation "Genesis", while the lower level is the abyss area - the "Sinkhole" where the sun never shines all year round, where acid rain and neon are intertwined.
Karen Vickers, an "echo detective" living in the Fallen Land. He is not an ordinary private detective, but a person with the ability to touch objects and sense the strong emotional memories left behind. This "talent", which he regarded as a curse, originated from the disaster that took away his family, making him stay with the ghosts of the past all day long, making him cynical and emotionally alienated.
He was used to searching for the long-awaited truth about trivial disappearances and betrayal stories in the dark corners of the settlement. Until a bizarre murder occurred in the Sky Dome District and he was forcibly pulled out of the mire. The deceased was the chief technology officer of the Genesis Group. No physical traces could be found at the scene. The only clues could only exist in the invisible echo.
Forced to cooperate with the cold and capable security director of Skydome, Karen stepped into the upper world that he both despised and was unfamiliar with. Every touch was a sinking of the soul. What he saw was not only the last fear of the deceased, but also a huge web of conspiracy involving the foundation of the city, technological ethics and the darkness of human nature.
