Yvette takes pop supremos Boyzone and their manager Louis Walsh on a trip into the unknown as they brave the shadows underneath the historic city of Edinburgh. Below the city, Yvette shows the boys a terrifying network of subterranean streets, which once occupied by criminals and the underclasses. Yvette then leads Louis and the boys to a hell on three levels as they descend through the forgotten streets to investigate a witches' lair and chambers believed to be haunted by evil ghosts.