Call Me Barabbas looks at the journey of both Paul Derry and R.C. Sproul Jr.​
 
Paul Derry, having a dramatic conversion after a life of scandalous living and R.C. Sproul Jr. having scandal in his life long after conversion.
 
R.C. Sproul told Paul, "You and I know that Jesus came to save sinners. The people in the world you came from know they are sinners but need to learn Jesus saves. The people in the world I came from (Reformed evangelicals) know Jesus saves, but need to learn they are sinners." Thus, the concept of Call Me Barabbas was born and turned into this book of two drastically different lives that share one major similarity - the grace and mercy of Christ Jesus.