Detective Conan: Quarter of Silence begins with a chilling act of domestic terrorism. Governor Yūichirō Asakura, having recently forced the relocation of a subway line, receives a life-threatening bomb warning. Moments later, a high-speed subway train narrowly escapes destruction as Asakura’s newly opened Tohto Line tunnel is violently detonated.Sensing a connection to a past case, Conan Edogawa deduces that the bomber holds a
personal vendetta against Asakura. He learns that the governor’s controversial dam construction project in the snowy village of Kitanosawa displaced a local community years ago. Driven by a relentless pursuit of justice, Conan, along with the Junior Detective League, Ai Haibara, and Kogoro Mouri, travels to the picturesque yet frigid mountains of Niigata to investigate further.In Kitanosawa, the group meets a tight-knit circle of childhood friends whose lives were forever altered by the dam project and a tragic hit-and-run accident that occurred eight years prior. Tensions run high within this group, and as the winter festival approaches, the
psychological pressure mounts. Soon, one of the childhood friends is found murdered in a secluded snowy forest, plunging the peaceful village into chaos and confirming that a killer walks among them.Conan realizes that the bomber and the murderer are the same person—someone whose life was shattered by the dam’s construction and the subsequent cover-up of the fatal accident. Meanwhile, the culprit initiates their ultimate, catastrophic phase: planting massive explosive charges at the Kitanosawa Dam. Their goal is to unleash a wall of water that will completely obliterate the village, silencing anyone who knows the truth.The climax explodes into a heart-pounding race against time. The dam's spillway is blown, sending a colossal, roaring torrent of freezing water rushing directly toward the village. While the adults evacuate the residents, Conan uses his high-tech gear to frantically track down the remote detonator and disable the remaining charges. However, a massive avalanche triggered by the explosions suddenly buries Conan beneath tons of heavy snow and ice. Desperate to save him, Ai Haibara and the Detective League lead a frantic search in the freezing dark. Utilizing their avalanche beacons and sheer willpower, they unearth Conan just as he suffocates. The villain is ultimately cornered by Inspector Megure and local authorities, bringing a dramatic end to their vengeful crusade.