Bertrand Russell's "The Problems of Philosophy" is a classic, and enduring, depiction of the fundamental concerns that philosophers seek to address. Is reality a fabrication of our own individual mind? If not, how do we know it is not? How can we know anything? What role does language play in our perception of reality? And so on. This work by Russell also has this going for it: complicated issues are explained simply and succinctly, making it an easily accessible introduction to 'the problems of philosophy.'