The Happy Hollisters and the Mystery in Skyscraper City (#17 in the Happy Hollisters series)At a school-benefit sale, Pete Hollister buys an old book about early New York tunnels. Tucked in the pages is a message written in Chinese. The only English word in it is "Help " The Hollisters take the mysterious note to a Chinese friend for translation and learn that the letter was written many years earlier in China by a Yuen Foo to his son in New York,...