Another group of problem pupils has arrived at Dogsbottom School from the local stage school. But these pupils are so keen that it's impossible to see why they would be a problem. When the rival school at Buttery St Crumpet announces it's putting on a play, Mrs Whiffy decides to outdo them by putting on a play of her own, but when the first night comes and the curtain is about to be raised, Mrs Whiffy and Bernie discover exactly what the problem is...