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Maggie Black does a fantastic job in describing the United Nations in all of its complexities and with great nuance. She does this with succinct, engaging writing filled with important information. It's a great tutorial on the UN that discusses both its achievements and failures. Black discusses the types of reforms needed at the UN as well. A friend of mine who has worked for the UN for 30 years says it's the best book on the UN and he's read many large tomes on this topic.
I am a member of my school's Model United Nations Club and found this book very helpful for bringing me up a level in terms of knowledge and ability. Knowing the precedents that have been set and the manner in which the real UN works was fantastically helpful.