The Koran. The holy book of Islam, according to Islamic tradition, dictated to the Prophet Muhammad from above. However, are the Koran and Islam equivalent? What changes and interpretations has it undergone over almost a century and a half? Why does Islam require that the suras of the Koran be memorized? And why? Is there a secret message to humanity hidden in the pages of the Koran? These are just a few of the questions that Bruce Lawrence, the most famous European researcher of the Koran, answers in his book.