C.S. Lewis' stepson, Douglas Gresham, and writer Paul McCusker are interviewed on today's Focus on the Family Daily Broadcast. They discuss the historical origins and generational impact of the Mere Christianity radio lecture series, which later became a classic Christian book. This was the basis for Radio Theatre's latest production, "C.S. Lewis At War," which is now available for purchase. Paul McCusker has also written a companion book called "C.S. Lewis & Mere Christianity: The Crisis That Created a Classic." You'll find the audio interview featuring Gresham and McCusker as well as a bonus video clip all on this page.