What do you do when Charles Dickins begins writing a murder mystery story, but never finishes it? You turn it into a musical, of course, and let the audience vote at each performance to decide which character they want to be the culprit. That is exactly what Rupert Holmes did when wrote the musical The Mystery of Edwin Drood. The musical, sometimes abbreviated to simply “Drood,” is an interactive experience for audiences, making it Broadway’s most original whodunit.