There are strange goings-on at the Opera House in Ankh-Morpork. A ghost in a white mask is murdering quite a lot of people, and two witches take a hand in unravelling the mystery.
The Opera House, Ankh-Morpork...a huge, rambling building, where innocent young sopranos are lured to their destiny by a strangely-familiar evil mastermind in a hideously-deformed evening dress...
At least, he hopes so. But Granny Weatherwax, Discworld's most famous witch, is in the audience. And she doesn't hold with that sort of thing.
So there's going to be trouble (but nevertheless a good evening's entertainment with murders you can really hum...) --This text refers to the Mass Market Paperback edition.