The Witches are my favourite Discworld series but I thought this was the weakest one so far. However I listened to the audiobook, narrated by Indira Varma with Bill Nighy and Peter Serafinowicz and I definitely enjoyed the story more because of that. The plot was pretty entertaining but I missed some references because I'm not really familiar with the story of The Phantom Of The Opera. Also I didn't feel like Agnes was dealt with particularly sympathetically as a fat character which did affect my enjoyment a bit.