To the point,
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This review is from: Scrum: a Breathtakingly Brief and Agile Introduction (Kindle Edition)
The book was very short, but to the point. I read it in around 30 minutes and it told me everything I needed to know about what scrum is and how to use it.
Totally worth the 77p I paid for it on Kindle, but I doubt it would be worth the £6 they're asking for physical copy.