en Cuevana 3. A toboggan train is coming to the village from the construction site of a drilling rig: a tractor pulling a carriage on a snowy track. It's blizzarding, fuel is running out, the train gets off track, and the construction manager is in a bad mood: his wife has recently died of a heart attack, leaving behind a teenage son who is here. But the worse the weather gets, the warmer the relationship between the people. And help comes.