All the kids from Wayside School had to spend 243 days in horrible schools while Wayside was closed to get rid of the infestation of cows! Now the kids are back and the fun begins again on every floor. Miss Mush has prepared a special lunch of baked liver in purple sauce and it is pet day on the 30th floor. There are dogs and cats and frogs and skunks and an orange named Fido, causing a terrible commotion. But the biggest surprise of all is that Mrs Jewls is expecting a baby and a substitute teacher is coming, and everyone knows what that means . . . Wayside School is going to get a little stranger.