The Uncommoners

When their grandmother Sylvie is rushed to the hospital, Ivy Sparrow and her annoying big brother Seb cannot imagine what adventure lies in store. Soon their house is ransacked by unknown intruders, and a very strange policeman turns up on the scene, determined to apprehend them...with a toilet brush. Ivy and Seb make their escape only to find themselves in a completely uncommon world, a secret underground city called Lundinor where ordinary objects...

Ivy and her friends travel to Nubrook, the magical trading city under New York to look for Valian's long-lost sister Rosie and put an end to the Dirge once and for all.