According to legend, Robert Johnson sold his soul to the devil so he could be a great blues guitarist. It’s something I was reminded of while editing the following interview with writer Cassandra Khaw, whose new novella, A Song For Quiet (paperback, digital) — the second book in her Persons Non Grata series after last year’s Hammers On Bone — tells the tale of a blues saxophonist who realizes his music doesn’t just cause people to get up and boogie.