For me for example its “Eat me - a natural and unnatural history of cannibalism” by Bill Schutt. Its an amazing book that covers cannibalism in animals and then the history of it in humans (cultural, survival & medicinal cannibalism).
I got a lot of “oh why would someone read something like that?” And “that not something fun to read about!” From relatives but my friends enjoyed the stuff that I could tell them about cannibalism!
As a non christian, I quite like the Screwtape Letters, by CS lewis, which is a series of letters from a demon in hell helping a demon processing a man tempt that man into sinning and going to hell.
I love The Screwtapepe Letters! The Oh Hello’s album Dear Wormwood is inspired by it.
I spent the majority of the 2010s OBSESSED with The Oh Hellos, and read the novel entirely because of them.
As a Buddhist, imagine my surprise in finding solace in A Grief Observed. It was and is the only book that helps me cope with my father’s death. Lewis is so candid and raw with his anger and rage, he didn’t try to find meaning in death.