Aliens! Immortality! Intergalactic intrigue! Government spies! Armageddon on the horizon! The 1964 Hugo winner, Way Station by Clifford D. Simak, has all of these things and much, much less.
Last time I wrote that The Man in the High Castle marks where science fiction breaks away from its Golden Age, but of course it's not that simple. Clear demarcations are rare in real life, and both Simak and Way Station (originally published as Here Gather the Stars) seem much more closely tied to an earlier era than Philip K. Dick's work does.