What is the theme in The Bookseller of Kabul by Asne Seierstad?

Ambition is another theme of the book, basically the ambition of Sultan Kahn. Sultan is a very ambitious man once he becomes a bookseller. Every thing he does is directed at establishing a base for the book business empire in Kabul. His son Mansur is not allowed to go to school or have any life of his own because he is needed to run one of the bookstores. Sultan expects the family to sacrifice for his business goals and to be as dedicated as he is to achieving his goals. He has plans to expand his business. He publishes his own books because Pakistan has no laws prohibiting books from being copies. Sultan has plans to print textbooks and establish libraries. His ambition is partly based on principle and his desire to help preserve the history and culture of Afghanistan.