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故事发生在人迹罕至的西伯利亚雅库原始森林之中，谢尔盖（叶甫盖尼·乌尔班斯基 Yevgeni Urbansky 饰）、安德烈（瓦西里·利万诺夫 Vasili Livanov 饰）、丹妮娅（塔吉娅娜·萨莫依洛娃 Tatyana Samojlova 饰）和萨比宁（因诺肯季·斯莫克图诺夫斯基 Innokenti Smoktunovsky 饰）是四名地质勘探队的队员，他们正在此处探索，想要找到珍贵的金刚石矿床。 　　茫茫的原始森林之中，想要找到小小的矿床是何等的困难，四人忙碌数日，却一无所获，纷纷陷入了心灰意冷的情绪之中。然而就在这个节骨眼上，丹妮娅在偶然之中挖到了一块金刚石，这也就以为着，矿床就在不远之处。勘探队绘制了地图准备将其带往总部，此时森林中忽然燃起了熊熊大火，在浓烟和烈焰之中，一行人为了保护地图而付出了惨痛的代价。The film is based on the eponymous book by Valery Osipov. Four geologists are searching for diamonds in the wilderness of Siberia. After a long and tiresome journey they manage to find their luck and put the diamond mine on the map. The map must be delivered back to Moscow. But on the day of their departure a terrible forest fire wreaks havoc, and the geologists get trapped in the woods.