Narrative to bring deep positive emotions

I have read that reading fiction can increase one's level of compassion for others.

This sounds good for me, because, while I don't lack compassion for the downtrodden or any battle that someone is going through, I do struggle with the general belief that many claim that people are generally good and I similarly hate the feeling that we are all so distant–cordial and polite rather than kind and concerned. I've never had serious depression or anything, I've just been disappointed that I can't see the automatic goodness or closeness that others seem to.

I think fiction would be better than any psychology or self-help or other book because I would see a character and their thinking in action.

Can you think of a book where the main characters seem to care about each other and have a general belief that they are all in it together and maybe even extended this feeling outside their circle?