After the tragic death of their father, Emily and Navin move with their mother to the home of her deceased great grandfather, but the strange house proves to be dangerous. Before long, a sinister creature lures the kids' mom through a door in the basement. Em and Navin, desperate not to lose her, follow her into an underground world inhabited by demons, robots, and talking animals. Eventually, they enlist the help of a small mechanical rabbit named Miskit. Together with Miskit, they face the most terrifying monster of all, and Em finally has the chance to save someone she loves.
Life has its ups and downs, doesnt it? And Martha and her friends are really sick of going up, and down, and up, and down. After a traumatic event that no one can talk about or even quite remember, theyre stuck on a giant killer jellyfish, tantalisingly close to the shore and safety. Theyve had enough of it. Theyve decided that theyre either going to escape, or die trying.