In the introduction to Essential Scrum, Ken Rubin writes,

This book, Essential Scrum, is an attempt to be the missing single source for essential Scrum knowledge. It includes an in-depth discussion of Scrum’s principles, values, and practices–one that in most cases agrees with other agile thought leaders and “The Scrum Guide.” (Where this book offers a different perspective from what is widely promoted elsewhere, I point it out and explain why.)

Given this, the question is, does it deliver on its promise?

Absolutely.
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