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Maskerade (original 1995; edition 1998)
Amazon.com Amazon.com Review (ISBN 006105691X, Mass Market Paperback)There are strange goings-on at the Opera House in Ankh-Morpork. A ghost in a white mask is murdering, well, quite a lot of people, and two witches (it really isn't wise to call them "meddling, interfering old baggages"), or perhaps three, take a hand in unraveling the mystery. Fans of the popular Discworld will be happy to see some old friends again in Maskerade, the 18th novel in the series. --Blaise Selby
(retrieved from Amazon Thu, 14 Feb 2013 13:58:58 -0500)
The seemingly benign ghost that haunts the Ankh-Morpork Opera House suddenly starts killing people.
(summary from another edition)
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