I watched the film adaptation by Pedro Almodovar titled "The Skin I Live in" ("La Piel que Habito") in 2011. I liked a lot the movie and when I found out that it was based on a novel, I decided that eventually I will read it.
Finally it happened. First of all, taking out the major surprise in the storyline (don't worry, I won't spoil it), both stories are quite different, so it helped to appreciate the novel, while being the original story, and still have some surprises or unexpected developments.
However, I think that the film had the avantage of analyzing the strengths and weaknesses of the novel and being able to create an alternate storyline, in some ways milder and some ways stronger.
I was hoping that the novel wouldn't have the limitations of the film in presenting the though and crude elements of the story that in both versions are kinda similar, however, while on the novel you met some more shocking scenes, at the end, I think that the overall impression of the development on the novel it falls in ending in a weak way from a strong premise with tremendous potential.
Revenge and madness are primary factors in the novel to construct this twisted and bizarre story, however, I think that the character Dr. Richard Lafargue failed to acomplish my own expectations of fulfilling his plans of insane vengeance. Even more since the developments in a key sub-story put him in a priviledged position to extend his vendetta but he got like "cold feet" and remembering his own human nature and even developing some guilt merged with impossible "love" feelings. I mean, I think that if somebody took so heavy steps to engage a revenge that after all, it's quite justified, well, having second thoughts after being on it for years it's quite disappointing from the point of view of storytelling. Maybe, just maybe it's more realistic, I don't know, I am not psychologist to know if somebody can change so much and expressing feelings so impossible ones after being for several years in the process of such deranged retribution.
But even the other main character is quite contradictional, maybe a little more justified for experiencing such unique events, however even so, it's also kinda dissapointing.
The story had so much potential for ending in a perfect scary tale, but I don't know if the author got frighten himself for the novel that he was writing. I wouldn't blame him since it's indeed a twisted and sick story. However, if he conceptualized it and decided to publish it, well, I think that he should have the nerves to finish on its full potential.
And after reading the novel, I didn't get the impression that he did that. It was like running a marathon and tripping over just a few meters from the finishing line and while he crossed it, he did it on limping without the same impact that he started the race.