When he first arrives in camp, and the prisoners' belongings are confiscated:
No one could yet grasp the fact that everything would be taken away.
I tried to take one of the old prisoners into my confidence. Approaching him furtively, I pointed to the roll of paper in the inner pocket of my coat and said, "Look, this is the manuscript of a scientific book. I know what you will say; that I should be grateful to escape with my life, that that should be all I can expect of fate. But I cannot help myself. I must keep this manuscript at all costs; it contains my life's work. Do you understand that?"
Viktor E. Frankl. Man's Search for Meaning. 1959. Translated by Ilse Lasch, Beacon House, 2006. Part I, p 14
Frankl was not able to keep his manuscript. Later, he attempted to reconstruct it from memory while still in the camps:
To avoid these attacks of delirium, I tried, as did many of the others, to keep awake for most of the night. For hours I composed speeches in my mind. Eventually I began to reconstruct the manuscript which I had lost in the disinfection chamber of Auschwitz, and scribbled the key words in shorthand on tiny scraps of paper.
Did Viktor Frankl ever publish this manuscript? Where can I find it?