Mum has bought curtain material for the soon to be newly decorated kitchen, and asks Dad to look after it while she is out. However, Dad falls asleep and mistakenly agrees that Dennis can use it as a giant sail. When Dad realises that it has gone, he calls Dennis to bring it back, but unfortunately Dennis gets into a spot of bother with the colonel, who takes the curtain material off Dennis. In an attempt to steal it back, the garden being wrecked and the kitchen is left looking like a bombsite. Dennis, Gnasher and Dad have to clean up the whole kitchen and redecorate it in time for Mum returning. When Mum decides it is time to hang the new curtains, Dennis is about to get the curtain material, but Mum reveals that she has changed her mind and bought new curtains instead.