The Count knows of a cure to the virus affecting Helena and the men at the base but requires an extra toxin to make it effective, and it is only available at the base itself. Spirou and Fantasio set off for the South Pole along with Spip and Helena who are dressed in special outfits which reduce the risks of infection. They arrive at a Russian base where they are given guides and snowcats for the journey to Isola Red. They set off, unaware that some men are tracking them from a distance with the intention of killing them before they reach the base.