Frank and Betty are invited to stay the weekend at Betty's brother George's electronically-designed home. George receives a visit from Mr. Fletcher, a house builder, who may well offer George's employer an order worth thousands of pounds if he likes the equipment, but after Frank loses his slippers down the toilet, trouble begins to brew. The situation worsens when the cistern starts to leak and the water ends up interfering with the house's electrical systems, causing all of George's electronic gadgets to become uncontrollable.