Write a review of the whole book of Walkaway. (You can see a sample of a professional book review of Walkaway here.) As you review it, try to answer some basic questions: what was best about the book, what was worst about the book, what is your overall judgment of the ideas that Cory Doctorow presents, and how effective do you find his presentation? Make sure to include some details from the last section to show that you have read the whole thing. One easy way to do this would be to start with a judgment of the conclusion of the book: is it effective and why? That can lead you to a broader review of the whole thing.