Night

From the text:

"You don't understand," he said in despair. "You cannot understand. I was saved miraculously. I succeeded in coming back. Where
did I get my strength? I wanted to return to Sighet to describe to you my death so that you might ready yourselves while there is still time.

Life? I no longer care to live. I am alone. But I wanted to come back to warn you. Only no one is listening to me …"
This was toward the end of 1942.