Very short and very good. The content is described in the other two reviews, and both story and Wittkop's presentation of it are arresting. This could have been a lurid tale, or one overwhelmed by a narrator's moral agonising over his actions, but Lucien's narration is calm, spare, subtly humourous, and sometimes poetic. The style is so attractive that when I tried to begin a more conventional novel shortly after finishing this, I gave it up as an irritant: relative to this book, it seemed ridiculously wordy. Wittkop passes no overt judgement on Lucien though she gently implies, through both his words and his actions, the extent of his self-delusion.
There is one rather colourful description at the book's beginning, but that aside I can't imagine a reader finding any of the incidents repugnant in a visceral way. A couple of aspects of the story did niggle slightly, though: Whilst the origin of Lucien's inclinations is entirely plausible, the passage detailing it doesn't seem quite to fit in--perhaps because it's the only one taking us back to the distant past--and I found it difficult to suspend disbelief so much as to accept without question Lucien's being able to dig up graves and take bodies home (via a lift, no less) to his apartment unobserved.
Overall, I'm left very eager to read more of Wittkop's books.