With one ring of the phone, Lisa Jefferson went from being GTE Airfone supervisor, suburban wife, and mother to being the listening ear to a nation shattered by tragedy. Called tells the gripping account of 9/11 from her vantage point. She recalls the moment she when took the call from Todd Beamer on United Airlines Flight 93, and when she heard the immortal words, "Let's Roll.” She remembers the way that her life was transformed vividly when she responded to the call. Jefferson sends a stirring challenge to all of us--whether it comes during quiet obscurity or international adversity, we must be prepared to answer God's call.