Fatal Echo

Criminal investigation captain Chen Feng and acoustic expert Lin Wei team up to hunt down the murderer. During the 72-hour countdown to death, they discovered that Xu Qingyuan was not only executing the target, but also conducting a "stress test" against the police. As the investigation deepens, an eavesdropping network and "black watchers" hidden within the city bureau surface, and the mysterious number "04-11-29-00" decoded by Lin Wei from the audio points to a hidden operation time that is earlier and more deadly than 72 hours.