Fisherman Eerik Storm is in danger of losing his home and agrees to get money to be piloted by smugglers. When the customs officers surprise the smugglers, a chase and a firefight ensue, in which the customs officers are confronted with water.

In northern Finland in the fall of 1916, Saima Niva rescues a man drifting in the river, who turns out to be a German lieutenant Braun. Braun and his six comrades have managed to escape the prisoner of war at the Muurmann railway station, but the lieutenant has had to get rid of the lost group. While Braun is recovering, under the good care of Saima, Niva's neighbor and henchman of the gendarmes, the greedy policeman Simpura, gets a tip about the refugees camped in the desert.

Eetu, a wealthy homeowner, attempts to seduce Leena Kosken. But when austere log boy Erkki meets her at midsummer dances, Leena falls in love with him instead. Jealous, Eetu turns the men of the village against Erkki and the Tukki people.