故事发生在1972年的德国，汉斯（尤利乌斯·维克考夫 Julius Weckauf 饰）是一个胖嘟嘟的九岁小男孩，生活在祖母经营的小铺子中。汉斯的性格并不是那么的讨喜，但是他有一项过人之处，那就是他拥有能够逗人发笑的特殊能力，无论心情再低落的人，只要和汉斯讲两句话，就会重新获得笑容。　　汉斯的母亲玛格丽特（路易斯·海耶尔 Luise Heyer 饰）病重，全家的重担都堆到了父亲的身上，为了养家糊口支付医疗费，整日埋头工作的父亲也渐渐失去了笑容。好在汉斯家族中的女性都十分的豁达而坚韧，她们的存在在潜移默化之中影响了汉斯，让他的心灵免受残酷现实的伤害。

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Atka Natas is a secret agent from the oppressive regime of Liquidatzia. He visits his estranged wife Vera, a chemist who is involved with a group of exiles trying to smuggle their compatriots out of Liquidatzia. Almkvist, an honest local policeman and former lover of Vera's, contacts her while investigating the death of one of the refugees. Natas has a list of agents operating in the host country and wants to sell them to the Americans. However before he can do so, Vera tries to kill him, after an argument about getting her parents out of Liquidatzia.

The boisterous, arrogant professor Challenger, a reputed biologist and anthropologist, dares the London Zoological Society to mount an expedition to verify his spectacular claim, without physical proof, that his previous expedition to the Amazonian basin found live dinosaurs. Apart from him and his 'socialite' counterpart, professor Summerlee, it consists of experienced discoverer Lord Roxbury, the young reporter Ed Malone -who got publicly struck down with Challenger's umbrella at his arrival- and Jennifer Holmes, Malone's news agency's boss's daughter, essentially as conditions for putting up the money. In Brazil they are joined by Jennifer's brother David and local 'guide' Manuel Gomez. They soon discover the dinosaurs are real and dangerous, like giant spiders, but loose their helicopter and thus are desperate for a way down from the isolated plateau. They learn Roxbury knew about the fate of Burton White, an explorer whose diary they find, thus presume to be dead, in search of diamonds, and confirmation of the local tribe being the lethal guardians of the plateau's secrets, but also get surprising help...