Eisuke manages to find another case and convinces Kogoro into taking it. A woman is murdered, and her son says he saw who did it. Conan realizes that the case has something to do with the organization, as the boy was a witness to Kir's abduction by the FBI in episode 425.

While at a Ski Resort, the Detective Boys encounter college students working on a project. During a blizzard, one of them goes missing!