Il Male Oscuro by Berto, Giuseppe

A confessional, inward-looking novel in which a man chronicles a debilitating, nameless illness — a creeping depression and psychosomatic crisis — through intimate reminiscences of failed relationships, family tensions and creative paralysis; as he submits to psychoanalysis he dissects guilt, sexual confusion and recurring self-destructive patterns, producing a darkly comic yet painful portrait of a mind at war with itself.

The 16900th greatest book of all time