I would recommend Darwin's own Origin of Species instead of Dawkins' Selfish Gene. I've read both. They can't even begin to compare. One is a serious scientific and a mind bending exercise in nature's ways, the other one deserves the title of pop culture. I cannot tell you the different beak sizes of Darwin's finches but I can tell you I've felt a void inside me after finishing the book and for a few years I thought constantly about the implications of the theory and saw behaviors around me that could be explained in terms of evolution, survival of the fittest and all that.
After you've read some serious books you won't ever say again that books "don't work". Schopenhauer said it better,
Students and scholars of all kinds and of every age aim, as a rule, only at information, not insight. They make it a point of honour to have information about everything, every stone, plant, battle, or experiment and about all books, collectively and individually. It never occurs to them that information is merely a means to insight, but in itself is of little or no value.