State Security Colonel Ryazantsev and his fiancée Eva Ershova were pulled out of vacation and given a strange task - to guard a dinosaur egg. It turns out that an egg with a living embryo of an extinct reptile was found in a glacier, and now it is being “hatched” at a biological station lost in the mountains. With nothing to do, Eva and Ryazantsev left the warm sea and went to the cold mountains. But they did not advance far - the road was blocked by a collapse, which, it seems, did not happen by chance. And then the biological station reported that their employees began to disappear. After that the connection was interrupted...