The oldest and most inscrutable empire on the Discworld is in turmoil, brought about by the revolutionary treatise, What I Did on My Holidays. Workers are uniting, with nothing to lose but their water buffaloes. Warlords are struggling for power. And all that stands in the way of terrible doom for everyone is Rincewind the Wizard, who can't even spell the word "wizard". . . and a very special butterfly.