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. Strapped to medical tables, and seconds away from being Walliam's newest medical guinea pigs, the pair have to fight for their lives to escape Walliams' evil clutches and come face to face with the monster that killed Harry Hill. But after taking it out, will Lorraine have spotted enough clues to correctly name the person behind this spooky supernatural adventure? And could you have done any better? Show less