Our guest on ST is Chris Cleave, the British novelist whose bestselling WWII-era yarn, "Everyone Brave Is Forgiven," has just appeared in paperback. As was noted of this book by an Amazon critic, when it was named (after first appearing in hardcover) as a Best Book of May 2016: "We've been wondering lately: What is the secret sauce that makes novels like Anthony Doerr's 'All the Light We Cannot See' and Kristin Hannah's 'The Nightingale' so popular, stories set against the backdrop of WWII?