The Roundabout Theatre Company is celebrating the 200th anniversary of Charles Dickens with new Broadway production of “The Mystery of Edwin Drood.” Rupert Holmes talks about writing the book, music, and lyrics, and Jim Norton and Jessie Mueller discuss their roles in the play. Set in a Victorian music hall, a rowdy ensemble of actors mounts a staging of Charles Dickens’s unfinished novel. Everyone on stage is a suspect in the murder of young Edwin Drood—and it’s up to the audience to choose the killer! Each performance ends differently, depending on what the audience decides. It’s playing at Studio 54 through March 10.