In the Diary of Anne Frank, Mr. Dussell (whose real name was Pfeffer) joined the Franks in their hiding place. He brought dire news about people that they had known being rounded up in the dead of night and taken off to labor camps. He also told them that there were exterminations taking place at the camps. No one that goes ever returns. This is a different tale than the information that the helpers (Miep, Kramer) had been telling them. Dussell mentions specifically many families that the Franks knew.