Harry, Ron, Hermoine & Ginny (Ron's younger sister) have graduated from Hogwarts and are enjoying a holiday in California. An attack by a hellhound brings the four of them into contact with Willow Rosenberg, Kennedy and Shannon, who succeed in eradicating the beast. Later, they learn from Rupert Giles, who had journeyed to America to warn them of a coming apocalypse, that the creature's master, Vokran, the most powerful of all demons, plans to re-enter this dimension by means of a phenomenon known as ‘The Black Storm’. Harry and his friends, accompanied by Willow, Kennedy and Shannon, go back to Hogwarts to seek advice from their former teachers about what they should do. They authorise an expedition to South America to prevent Vokran's return.
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