Why did Rivka refer to her brother as “one of the walking dead”? What did she mean when she said “As long as we can remember, all those gone before are alive inside us”? Do you agree with her?

Wolfe was so scarred by his experience in the camps (he was forced to transport bodies to and from the crematorium) that he may as well have been one of the dead.

The second part of your question calls for your opinion.