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The Opera Ghost appears in Maskerade, haunting the Ankh-Morpork Opera House. He demands a box on every opening night--Box Eight. Are you surprised at that?

He reputedly kills various people at the Opera House, but also has been known to anonymously train an aspiring diva even if he thinks it is another diva wannabe. The ghost sends highly calligraphic notes to the the Opera House Owner directing him to have the ghost's protege in a particular role. Then sends notes warning of impending death and uses five exclamation marks!!!!!.

By the end of Maskerade, the Ghost is revealed to be two persons: Salzella and Walter Plinge, both opera-mad in their own way. For Salzella, it ends in his operatic death, for Walter in a rebirth as the artistic director of the Opera House.