Scrum: a Breathtakingly Brief and Agile Introduction (Amazon) was as brief as the subtitle promised. A friend recommended it as a good primer, and as my understanding of Agile comes from university and osmosis, I bought the book and gave it a read.
I appreciated how succinct it was, and feel like I have a good grasp on what Scrum is (and isn’t) now. It felt expensive for a ±20 minute read, but perhaps I was paying for the time I didn’t spend reading extra unnecessary verbosity.