"Cross and the Switchblade" is a book written by David Wilkerson that tells the true story of a pastor who reaches out to gang members in New York City during the 1950s. The narrative focuses on Wilkerson's efforts to help troubled youth, particularly those involved in violence and crime, by introducing them to faith and hope. The book highlights the challenges Wilkerson faced while trying to connect with the gangs, including the Mau Maus and the Bishop gang. It emphasizes themes of redemption, love, and the transformative power of faith, ultimately showcasing the impact of one person's dedication to making a difference in the lives of others.