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.
Also known as:
The Letter That Was Never Sent, The Unmailed Letter, The Unposted Letter, The Unsent Letter