Here is a bracing video on the Muslim Brotherhood and its plans for the West.
If you want short books that outline the ideological and theological reasons for why Islamists want to bury us, you will find them clearly put in:
Mary Habeck, Knowing the Enemy (Yale University Press, 2006)
This book offers a very clear explanation with backup of Islamist reasoning, sources of that reasoning, and their organization to establish their new Caliphate.
Robert R. Reilly, The Closing of The Muslim Mind: How Intellectual Suicide Created The Modern Islamist Crisis (ISI Books, 2010).
This book takes us back into the roots of Islamism and how and why the West is now facing an implacable ideological enemy.
Saayid Qutb, Milestones.
This is a key work by one of the most influential Islamists. Its a harangue. But if you can stomach it, you will see why it influenced so many in the Muslim Brotherhood who continue to consider him their ideological professor.