My guest this week is the author of Girl on a Train. No, another girl, another train. I first came across her work when she wrote very entertainingly about how her psychological thriller had been mistaken by readers for the much-hyped title by Paula Hawkins. And they were happy to have found her, for she gained many new fans. I then discovered she used to be a musician, and has played in all the major London concert halls, so I had to enquire whether music played a role in her writing. It certainly does – she has written a haunting, thoughtful post about the music that helped her layer her work with complexity, loss and betrayal, especially movie soundtracks like Blue Velvet and Let The Right One In. She is AJ Waines and she’ll be here on Wednesday with her Undercover Soundtrack.