I read an amusing list of classic novels abridged down to two sentences. For the sun also rises it was abridged to ‘the lost generation drinks a lot and is still lost.’
That’s pretty good. Really, it’s the only novel I can think of that has no plot on purpose for such a long time, just mindless drinking and shallow conversation, all building up to the payoff of bucolic silence, peace and power. Of course, whether you think that build up of wasted tension is worth the temporary payoff depends on whether you’re a fan of Hemingway or not.