Melinda Messenger and Dominic Littlewood come to the aid of a couple from Potters Bar, Hertfordshire. John Smith used his redundancy money to pay for an extension to his family home, but after six months the builders downed tools and walked off the job - leaving it leaking, freezing and unusable. While Melinda gets to work repairing the mess and organising a welcome home party for 50 people, Dom sets off in search of the tradesmen who left it unfinished