“Professor Allhoff has written a challenging work that is sure to generate controversy among both the supporters and critics of the United States' war on terror. He applies philosophical, legal, and political approaches to deepen our understanding of modern terrorism, the ticking-time-bomb hypothetical and national security. His methodical arguments and brave conclusions will not please everyone, but it will press them all to become more rigorous in their thinking and more careful in their judgments. Anyone interested in the difficult questions posed by the 9/11 attacks and the US's response will want to read this book.”—John Yoo, University of California, Berkeley