Sarah Beeny intervenes to help a family terrified that their home in Swinton is falling down a mineshaft. With a history of mining-related collapses in the neighbouring streets, and worrying signs of structural failure, Mandy Franks and family are desperate for the truth. Cracks in the wall come back as fast as they can fill them; damp and mould are spreading across the upstairs; and the back end of the house is sinking slowly but surely into the ground. They have already spent over £50k trying to fix their home, but none of the costly work seems to have solved the problem. Could the Victorian villa be about to fall into a mineshaft? Or could the mystery cracking be due to the regular delivery of heavy beer casks to the pub next door? Sarah gets her team of specialists to work with a detailed map survey of the vicinity and the use of ground penetrating radar to check for voids. Will their discoveries confirm the family's worst fears? And will her no nonsense approach plus step-by-step tips be enough to rescue their home from the brink of disaster?

• Sarah Beeny