Describe the strategies that Vladek used to conceal Anja and himself during the liquidation of the ghetto. How did the Germans flush them from hiding?

To protect himself and his family, Vladek builds a shelter under a coal bin, in which they hide during Nazi searches. Soon, though, they are moved to a different house. Again, Vladek builds a shelter, this time in the attic and accessible only through a chandelier in the ceiling. One evening, as they are leaving the shelter, they see a stranger below. It is a Jew, who tells them that he was only looking for food for his starving child. They think about killing him to be sure that he will not report them, but they take pity on him and give him some food. That afternoon, the Gestapo arrives and takes Vladek and his family into a secure compound in the middle of the ghetto.