Two students are dead. All the victims have been Class A members. Megu questions the existence of another person in the island, since the only things taken from the kitchen were butter and flour - certainly nothing enough to feed a person and Dan concludes that the murderer is among them. Even as Kyu is remains bothered by the shoe prints, Ryu solves the mystery of the double locked door room. Kyu gets re-affirmation from Ryu that the shoe prints are suspicious as they are too clean...