Naoki Urasawa's Monster Season 5 Episode 3 5-03

Inspector Visbaugh, who was in charge of the murder cases concerning the Lieberts and the Eisler Memorial Hospital victims, is nearing retirement. His final job is to transport Dinger, a multiple homicide offender. While on their way in a train car, Dinger tells Visbaugh that he committed his first murder after being encouraged by a small boy. He says that the boy had a twin sister. Visbaugh realizes that those twins are the key to the case concerning Dr. Tenma, but he has only thirty hours until he retires!