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.
There has been a terrible mistake. Wayside School was supposed to have been built with thirty classrooms all next to each other in a row. Instead it was built with the thirty classrooms all on top of each other - thirty storeys high! That may be why all kinds of strange stuff happens at Wayside School., Especially on the thirtieth floor. It is a school full of unusual characters too.
'Watch closely,' said Mrs Jewls. 'You can learn much faster using a computer instead of paper and pencil.' Then she pushed the computer out of the window. The children all watched it fall thirty floors., 'See?' said Mrs Jewls. 'That's gravity ...' That's the way things happen at Wayside School. There are twenty-nine kids in Mrs Jewls' class and this book is about all of them: there is Todd, who is in trouble every day, until he gets a magic dog; Paul, whose life is saved by Leslie's pigtails; Ron, who dares to try the cafeteria's mushroom surprise; and all the others who help turn a day at Wayside School into one madcap adventure after another.