"The Dinner," by Hermann Koch

This is a terrific read...huge best seller in Europe, translated into god-knows how many languages. Start reading and you will have a hard time stopping. The author is Dutch, and the story is set in Holland, where the brother of the narrator is a popular candidate for prime minister in a coming election.
The novel is a first person narration, unreliable only in the sense that the narrator is very slow to reveal his own--what?--failures, peculiarities, mental problems: these emerge in the course of a narrative centered around an extended dinner at a fancy restaurant with his wife, his brother, and his brother's wife--a dinner that gets spun out over the novel, with much else going on besides the eating, including some diversions on topics of scorn for the narrator--for example, on the Dutch owners of second homes in The Dordogne. The back story that brings them together is the  realization that the sons of the two families--cousins--have committed an outrage involving a homeless person--much of which was recorded by a CCTV camera. 
A couple of quotes from reviews: "there is a bracing nastiness to this book that grows ever more intense..." That from a very praiseworthy review. Yes--the nastiness is there: but there is much that is bracing. 
And from another review : "It will not please those who seek the easy, the redemptive, or the uplifting in a narrative."

I just guess that if you start it, you will finish it.