This is not a show where you plop your derriere in the seat and just watch. The audience votes on the ending of The Mystery of Edwin Drood, a musical "whodunit" based on the unfinished Charles Dickens novel of the same name. The plot centers on a love triangle involving John Jasper (a Jekyll and Hyde choirmaster), the object of his affection (Miss Rosa Bud, his music student) and Jasper's nephew, Edwin Drood, who happens to be engaged to Miss Bud. The title character mysteriously disappears. Is it murder? The answer is up to you. The MAD Theatre production runs through Sunday at the Shimberg Playhouse at the David A. Straz Jr. Center for the Performing Arts, 1010 N MacInnes Place, Tampa. Shows are at 8 p.m. today through Saturday and 2 p.m. Sunday. $22. (813) 229-7827. strazcenter.org.