Arthur's best friend Cecelia passed away from a mutation--only for her to return as a zombie! Frustratingly, no-one believes him it is a zombie. It's up to Arthur to figure out why his buddy returned from the dead, and uncover the secrets of the sinister Nightshade Labs. Who was the necromancer--the no-good troublemaker Vivi, the head-of-lab and millennium scientist Minerva, or the bizzarre (but very sweet) Dr. Foggy?