I just finished reading from cover to cover the book Head First Agile: A Brain-Friendly Guide to Agile Principles, Ideas, and Real-World Practices. Even before I finished reading it, I started recommending this book to my co-workers. I tell them that they can get almost everything they need to get started in Scrum by reading just the first four chapters.
I own a number of books in the Head First series. Like the For Dummies series, the "Head First" books provide fun introductions to a variety of topics. Unlike the "For Dummies" series, you do not have to explain that you are not trying to insult someone when you recommend one of their books.