Sword of the Prophet doesn't sugarcoat the problem. Indeed, it declares itself as "The Politically Incorrect Guide to Islam", and identifies the rise of Islamic fundamentalism as the greatest danger to our values since the end of the Cold War.
The author, Serge Trifković, sees the source of this threat in the absence of separation of church and state under Islam - because Islam is a way of life, Muslims are required to subordinate themselves to the teachings of Allah and live as members of the total Islamic community, calling into question their ability to give their political loyalty to a non-Muslim state. Trifković considers this to be a particularly important issue for the countries of Western Europe, with a population of over 50 million Muslims, and the United States (approx. 3.3 mill).
Neglect to read it at your own peril. As the author concludes, "Islam is a collective psychosis seeking to become global, and any attempt to compromise with such madness is to become part of the madness oneself. No one who believes that jihad is the right or duty of all Muslims, or who promotes adoption of Shari'a law or reestablishment of the caliphate, should be allowed to settle in any Western country, and every applicant should be asked. The passport of anyone preaching jihad should be revoked. This may be called discrimination but the quarrel is not of our choosing ... Secularists and believers of all other faiths must act together before it is too late."
The book's 300 pages are well researched and cross-referenced with plenty of footnotes but I concede that it's not easy reading, so for those of you who are more into "Home and Away" and "Neighbours", here's a documentary along similar lines: