Things get very strange in Successville as reporter Harry Hill is found dead, covered with radiation burns and surrounded with weird footprints that look like they belong to a monster... DI Sleet and his new celebrity sidekick Lorraine Kelly delve into all things supernatural as they grill this week's suspects: Ant and Dec, a couple of backwards hillbillies, who run mystery tours. With Sleet getting distracted by Dec's hip new line of craft beers, it's up to Lorraine to lead the investigation. Madonna is a recluse, having undergone shady medical tests many years ago at a shadowy chemical factory. Rumours of monsters and mutated creatures surround the factory, so Sleet and Lorraine try to get some intel from Madonna by posing as old high school friends. Someone clearly thinks Sleet and Lorraine are sticking their noses where they're not wanted, as they are captured by the owner of the mysterious factory, which turns out to be David Walliams.