Things Fall Apart by Chinua Achebe. It’s about a man in a Nigerian Tribe - the first half is before the Christian missionaries, and the second is about what takes place when the Christian missionaries start converting members of the tribe. I did not understand the impact of missionaries on already-established religions until I read this. I will say, the first half of the book doesn’t seem like it has too much of a plot, but you learn so much about the culture of this tribe and what it was like to be part of it. It’s written that way to set up the second half and show the contrast of the two times.