If i could be one book, i would be " The Social Contract" by Jean Jacques Rousseau. Why would i be this book? Because it was an exemplary piece of liteature that described the methods of how to set up a justly governing body, that served the peoples will.
In the book Rousseau argues against forms of government that were ruled by a single person, or even a small group of people. He insisted that it was only when the people of the state collectively set up the ruling form of government, that it could be considered a just one.
Rousseau also talked about mankind's rights, and ability to live freely, while serving their fellow man, and how to set up the foundations of a sociable community. By everyone taking up a small bit of responsibility, Rousseau explained that the whole of the community was free, because no one member was given to much work.
Rousseau’s most famous phrase, “Man is born free, but everywhere is in chains,” was a widely popular cry that helped to inspire the revolutions that are responsible for the modern world today. Although not very long, over the span of about 300 pages, Rousseau describes how to create a nearly perfect community, and a decent form of government. Though I do not agree with everything in the book, it is none-the-less a spectacular read.
While some have argued that Rousseau was speaking about a society that would have to be communist in order to exist, http://www.theneohumanist.net/TheNeoCommunistManifesto/rousseaus-general-will, we should remember that Rousseau was a romanticist philosopher, and was a supporter of nationalism, and equality for all members of society, both of which are the basis of communism when taken to the extreme. So of course there would be some communist sounding thoughts. However, Rousseau was also a strong believer that everyone should have the right to be free, be able to live their lives how they want, and that the government should have limited control of the public, quite contrary to communism.
My answer to why I would want to be this book, is that it promoted ideas of ethical, moral, and civil wellness for a society in a time, and place when monarchs ruled the lands however they saw fit. It was a brave piece of liteature, that the founding fathers of American society based many ideas of freedom, and the role of government on. Although there are several other books that would no doubt be more fun to be, like Sherlock Holmes, this is one of the most important books in history, and should be preserved.
If you want to read the social contract, it is available for free at http://www.constitution.org/jjr/socon.htm