John Searle's "The Mystery of Consciousness" is a wholly remarkable achievement. Materialists and Dualists alike will find it an intriguing work, as it not only gives Searle's own opinion, but also examines the work of many of the other leading philosophers and scientists in the field. The result, is a thorough dosage of a wide range of opinions.
For those unfamiliar with the philosophy of consciousness and the science of the brain, this book is simply an excellent starting point. Through this book, one feels free to make their own decisions about modern theories and has a wide range of options on how to proceed with their discovery of our consciousness. It is written with all levels of readership in mind, without being patronistic, which some books intended for "the lay population" can be.
For those already attune with the field, purchase this book from Amazon, and you'll be pleasantly surprised. It may even change some of your "concrete" opinions!