Horrible things can happen to a show right before it opens. Although by tradition, it “must go on,” sometimes a show simply cannot.

That fate awaited Austin Playhouse’s revival of “The Mystery of Edwin Drood,” the delightful musical based on an unfinished novel by Charles Dickens. The audience chooses among potential endings during each performance. The Playhouse staged a hit version of the ensemble show in 2005.

Scheduled to open this weekend in the Playhouse’s ACC-Highland theater, “Mystery” has been postponed because, on Nov. 3, a sewage pipe above the theater broke its sealing cap, sending filthy water in the artistic space.

“Things are a little hectic right now as we rebuild our stage, find new spaces for rehearsals, and try to add additional performances to make up for our lost ones,” said Playhouse spokeswoman Marie Fahlgren. “By the time ACC shut the water off, it had already gotten into the backstage area and some water had splashed onto the stage near where the pipe broke.”

Environmental and disaster damage teams are assessing the scene.

“Our opening night party will take place on Nov. 30,” Fahlgren said, “and we hope to add preview performances on Nov. 23, 24, and 25 if space is ready. Currently, new sheetrock is being installed and the new stage floor will be installed by the end of the day. We hope to confirm the updated performance schedule this week.”