Ugh! Thumbs up authors, thumbs down packt (fix your book naming schemes). As someone who has read Packt books in the past, their overuse of the word "Mastering" in book titles is definitely problematic.
What's ironic is the other Grunt books I've found so far are super in-depth and theoretical, when I really just wanted to learn how to strength my web dev skills. Thankfully, I found this book on the internet because of its description:
"Who this book is for - If you are a JavaScript developer who is looking to streamline their workflow with build-automation, then this book will give you a kick start in fully understanding the importance of the described web technologies and automate their processes using Grunt."