Christmas is just around the corner and Mike's mum Betty is staying - and testing Mike and Alison's patience with her interfering ways. There's no easy way to ask her to go home so the couple - and the ghosts - struggle on, with Button House feeling fuller than ever. Now a convert, Robin is missing that all-important 'Christmassy' feeling, so the gang members share their secrets to getting into the festive spirit - but when even more decorations and merry music don't do the trick, the ghosts wonder if Robin will be able to capture that Christmas magic again