What inspired this question for me was reading Alex Haley’s “Roots” after having just read “Beloved” by Toni Morrison. I thought that the two taken together give a wonderfully detailed image of American slavery and it’s effects on the body (Roots) as well as on the soul (Beloved).
Another that came to mind was Jack Kerouac’s “On The Road” and Hunter S Thompson’s “Fear and Loathing in Las Vegas” as I personally felt that FaL was written as a direct parody and skewering of the kind of transcendentalist optimism we see in someone like Kerouac.
I guess I’m thinking of books that look at similar issues from complimentary angles or books that seem heavily inspired by others and almost responding or expounding, so that you come away having learned more than the sum of their parts.
EDIT: Doesn’t have to be all fiction. Non-fiction is welcome as well.
The Power and the Glory by Graham Greene and Silence by Shusaku Endo. They both feel as if they are in conversation with each other. Both stories are about a flawed priest suffering in a land where Christianity is persecuted and how one maintains faith in a dark situations and hopelessness . The books also have dramatically different conclusions but still are deeply Christian to their core.