Many books about terrorism begin with a personal anecdote about where the author was on 9/11. Political Scientist Jocelyn Jones Evans was working on the Hill when the planes hit and changed the course of American national security policy.

“For the first and only time in my life,” she recalls, “I remember rolling down my windows to see and to hear the news for myself.”

One Nation Under Siege though, isn’t a book about policy. It’s a book about how 9/11 and its aftermath changed the culture of Congress, and how those changes have affected the work of government and the American people’s access to their own representatives. Drawing on dozens of interviews with Hill staff and legislators, Evans vividly depicts the impact of the threat of terrorism on congressional culture after 9/11 through a combination of narrative and political science.