Uniquely occupies three roles simultaneously: the man who suffered, the psychiatrist who observed, and the philosopher who theorized. The triple perspective is the book's source of authority and its occasional weakness — Frankl can seem to have processed his experience too cleanly, too usefully. But this may be the point: the processing is itself the survival. He did not just live through the camps — he made something of them, and that making was already underway in the camps themselves.

Never appears directly — she is always the image Frankl holds in mind during imprisonment. Her function in the book is profound: she is the evidence for the claim that love is not contingent on the survival of its object. Frankl loved her, was sustained by her image, and built his survival partly on her — while she was, unknown to him, already dead. The meaning held. The love was real. The object was gone.

Frankl describes various senior prisoners who either maintained or lost their humanity. The contrast between prisoner-capos who became brutalized and the rare figures who maintained generosity and care serves as empirical demonstration of the inner freedom argument — the same institutional role, two radically different responses.

Frankl deliberately withholds names. His fellow prisoners are presented as exemplars of psychological principles — the man who died when his deadline expired, the man who gave away his last cigarettes, the man who saw beauty in a sunset through the barbed wire. They are witnesses to the theory, and their anonymity is partly protection and partly methodology.