In this thrilling mystery from an award-winning author, Zander is determined to do whatever it takes to save his grandmother’s nineteen-story out-of-this-world department store—perfect for fans of The Swifts and The Mysterious Benedict Society.   Zander Olinga’s grandmother is the owner of the fabled Number Nine Plaza, the spectacular nineteen-story skyscraper. The Nine, as it’s called, has everything imaginable, including a massive Ferris wheel on its rooftop, monorail track