The Selfish Gene
In general terms, this is a good book, it has an accessible language to deal with a not so simple subject. The examples and studies are discussed in an in-depth manner (although not without biases).
Unfortunately, the theory itself doesn't seem right to me. The author was selective on the examples, some of the theories used to support his view are known as outdated nowadays (mainly biological ones). Also, in different places his theory opposes Darwin's evolutionary theory, which is hard to ignore!
A big flag to me is that we don't know exactly how genes work. We know some functions for some genes, but we have a lot of missing information about this workflow. And creating an entire theory upon this thing we barely know is a kind of shot in the dark. Some great theories emerged from shooting in the dark as well, like relativity and double helix theories. But different from "The selfish gene" theory, they have solid experiments that help to prove the point and don't have a lot of gaps where the theory just doesn't make sense, like "The selfish gene" does.
If you like science and care to understand how things work maybe it's a better idea to spend your time on some already consolidated work.