Absent Ghost

The wife and daughter of Japan's top technology entrepreneur Tendo Satoshi have been kidnapped, and the ransom demand is to recover their stolen "Genesis-level" cryptocurrency private keys that are said to be able to subvert the global financial system. But after Keisuke Nogami was commissioned to investigate, he discovered that this was a "perfect crime" wrapped in layers of cutting-edge technology. The disappearance of the private key leads to a technology plagiarism case twelve years ago, and the murderer may not be a human at all, but...