I have read a good handful of stories by Bernhard, but this was my first Bernhard novel. I chose it for a somewhat perverse reason: I had read that its sentences had the highest score on someone's "difficulty of reading" index. The sentences of Correction are long, true, but are not complex in the way that (say) Proust's or Faulkner's or Broch's are; they extend over whole pages because the narrator keeps interrupting himself to explain, or qualify, or revise, so the effect is more one of garrulity than complexity. The prose is not all that hard to read.
It's a worthwhile read, though. The (unnamed) narrator is writing to explain to us the life and work of his brilliant friend Roithamer, one of the sons of a wealthy and prominent family and a polymath of genius. His final project was to build a cone-shaped dwelling for his sister in the center of a forest on or near their family estate. He completes the project, but his sister dies before she can move in, and Roithamer then kills himself--his suicide is the "correction" of the title.
I don't think the preceding paragraph would count as a spoiler, by the way--we learn of all these events within the first few pages. There is no suspense in the novel, nor plot, really--just the intelligent-but-not-brilliant narrator doing his painstaking, constantly self-correcting best to understand and help us understand his terrifyingly brilliant friend (based on Ludwig Wittgenstein). Rough analogues might be Serenus Zeitblom in Mann's Doctor Faustus trying to explain Adrian Leverkühn to us, or Lenù trying to explain Lila in Elena Ferrante's quartet, or even Jeffrey Cartwright trying to explain Edwin Mullhouse in Stephen Millhauser's strange and wonderful Edwin Mullhouse.
Bernhard's vision of the situation is a bit darker than Millhauser's, Ferrante's, or Mann's, which should come as no surprise. Genius is pain, as John Lennon explained to Jann Wenner back in 1970, and the pain in Correction is as bottomless as Roithamer's genius.