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«Masquerade» is the fifth novel in the witch cycle from Terry Pratchett's Disco World series.

The irrepressible Granny Rainbow and Auntie Ogg are once again setting out to discover new horizons - this time, opera. Of course, the witches find themselves in the thick of it: The Anchormork Opera House is being terrorised by a mysterious masked ghost. Although its appearance used to be considered a good omen, now that accidents and murders are happening all the time and the opera company has suffered significant losses, someone has to find out what's going on.

However, the real target of the witch's interest in art is Agnes Nitt (aka Perdita X), a beautiful girl with an outstanding figure and exceptional voice who has every chance of joining the witch's cause, but instead has left to conquer the big city and doesn't want anyone to chart her destiny for her. However, it doesn't seem that Granny and Titunya are particularly concerned about this...