Just finished "Rogue Moon" by Algis Budrys.
This book didn't have to be "Science Fiction" as it's really a very in depth character study. When reading this, I was reminded of "Whose Afraid of Virginia Woolf" in as much as the dialog between all the main players kind of fleshed out the "truth" hidden behind the character.
But, since this was written with a Science Fiction backdrop and, I think to the stories benefit...that element enabled Budrys to embark on a methodical study of lofty philosophical deep thinking such as what does it mean "to be", the nature of death and what is the driving, shaping force that leads individuals down their life's pathways.
Characterization, done exclusively though dialog is vivid. It's a short 180 page novel but the talented author packed it to the gills with details that enabled the reader to paint, in raw, high-def detail a picture of the 4 main characters (and even a couple of minor one's) that dominate this book. If that wasn't bonus enough, you also get a fairly brilliant (albiet a little dated, but this was 1960) science fiction tale that had elements of "2001" in it's Big Dumb Object on the moon concept that kills every living thing that attempted to unlock it's secrets and a very interesting deconstruction (pun intended) of the consequences of human matter transmission as in the ..."Beam me up Scotty" sort. The difference between this and the "Star Trek" kind though is the fact that the process of "beaming up" actually creates a clone of sorts of it's subject. These clones are used to explore the BDO mentioned above and are subsequently killed off creating a very interesting conundrum for the surviving original down on earth. To say any more might get me into spoiler territory but, the final ten pages or so really drives home some rather disturbing thoughts on death and the afterwards...and all dat.
The fact that very few of the characters were exactly likeable didn't preclude me from wanting to know how their individual story lines were going to end up and, to add to the strength of this novel, Budrys resolved everything that needed to be resolved. He also left some things un-resolved that I felt needed to be left that way. (You'll know what I'm talking about if you read it.) So, no spoon feeding info-dumps here, just really good food for thought.
Recommended...highly!