在神奇眼镜的帮助下，一个小女孩从沉闷的夏日下午进入了一个令人兴奋的世界，有红树林沼泽，喷溅的火山和海洋，鸟类颠倒飞行，野生动物威胁扑来。但她并不孤单。姆明谷的老朋友——赫穆伦、嗅嗅、Snufkin、Thingummy和鲍勃——加入了她的旅程，姆明也乘坐一个条纹气球来拯救他们。
A little girl is transported with the help of magic glasses from the tedium of a summer afternoon into an exciting world of mangrove swamps, spluttering volcanoes and sea where birds fly upside down and wild things threaten to pounce. But she is not alone. Old friends from Moomin Valley - Hemulen, Sniff, Snufkin, Thingummy & Bob - have joined her on the journey, and Moomin too, who rides to their rescue in a stripey balloon.
