This book is a great tour of the intelligence problem we face.

It is quite opinionated and as a first book in this space you may be lead to believe too much of what Nick Bostrom says as being consensus opinion. Regardless he introduces and summaries the main points to give one an understanding of the space quite well.
The subtitle is quite an apt description of the book, what is and how we will get superintelligence, the problems and pitfalls of superintelligence and thoughts and ideas on what we can do to try and avoid it.

The book also in some ways makes the implied argument that it is one moral imperative to work on this problem first!

A good read.