The Last Kids on Earth and the Doomsday Race (Book 7)

With his zombie-controlling powers growing stronger, Jack Sullivan and his buddies are road-tripping toward the mysterious Tower, where they must once and for all stop Rezzoch the Ancient, Destructor of Worlds, from descending upon our dimension. But their journey is sidetracked when they are swept up by the Mallusk, an enormous centipede monster carrying the world's largest shopping mall on its back.