If you're looking for something a bit more digestable, you could try "Biological Psychology: An Introduction to Behavioral, Cognitive, and Clinical Neuroscience", which is more appropriate for a survey level (100, 1000, depending on your school) course.
That's just a reference volume. It's fine for what it is, but really as a launching off point for specific topics. And reading it cover to cover would get old, fast.
I'd second principles of neural science, though that's with the expectation that the reader has the appropriate background in basic chemistry, biology, and maybe anatomy. Out of the dozens of books I have on neurosci, that's probably the single most comprehensive.