I recently purchased this book and I really liked reading through it. It is not an advanced material on Scala, but it really helps you understand the Scala language basics. To my surprise, there is even a chapter on Web Services. As I keep saying that the core language features of Scala is huge compared to that of
Java, this book is a welcome addition that would enable you to get quickly familiarized with the language basics. If you looking for some good introductory material, go for this book. You will learn from the vast amount of examples given in this book.