Zombie Zoo: Adventures in Tub By Melanie Abed – Presented By The Children’s Book Review. For Ages 9 to 13. Thirteen-year-old Felix Fizzystyxx is an aspiring naturalist who observes the world from his hidden tree fort at Wayward Amok Orphanage. When he witnesses glowing green goo and strange behavior in the orphanage, his life as a quiet observer ends. He partners with Ninja, an intense, shadow-dwelling orphan who trusts her instincts and operates alone, to investigate. Together they discover that the orphans — and soon the entire town of Spinachi on the island of Tub — are turning into wood-eating zombies controlled by a hive mind. Download Free Activity Kit and Enter Giveaway.