Nowadays, even books have movie trailers. Tracy Groot, a historic fiction writer, needed a Web piece to show her latest offering, “The Sentinels of Andersonville”. The book told of inhumane conditions at Andersonville Prison toward the end of the Civil War and how three Confederate townspeople came face-to-face with the prison’s atrocities. Made entirely from stock footage, stock music and then distressed to look like a Mathew Brady “tintype”, this was a fun project to do and great for the book.