有一天院子里忽然飞来一个竹蜻蜒，上面是一幅莫名其妙的图画。几个孩子认定不会写字的黑妞儿发来的，分析了一番，结论是黑妞儿在大山上遇险了，于是立即乘了阿辛制作的飞箱子赶去营救。他们先后到过好几个莫名其妙的云中的国家，终于探听出的黑纽儿的下落，他们能不能把黑妞儿救出来呢？
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