Darke
Angie Sage
 While Simon is being reunited with the Heaps, the witches of the dangerous Port Witch Coven try to kidnap Princess Jenna so they can rule over all other witch covens. Meanwhile, Marcia Overstrand and Alther banish Tertius Fume who is located in Dungeon Number One, but Overstrand accidentally banishes Alther as well. So Septimus, who is approaching his Darke Week, decides to rescue Alther from the Halls of Darkenesse for his Darke Week challenge. While this is happening Merrin Meredith, with his small army of Things, creates a Darke Domain which threatens to engulf The Castle and all its residents. Furthermore, to add to Septimus' troubles, Meredith engenders a ferocious Darke dragon.