1918. Thousands of volunteers hurry to defend a nascent Republic of Estonia against the advancing enemy from East and South-East. Among others three brave young men - a student, a blacksmith and a farmhand - enlist to the Estonian People's Army. Three of them go scouting together and shoulder by shoulder they fight in battle. With strenuous effort the enemy's overwhelming contingent is pushed back...

Lieutenant Ville Somero investigates a sabotage at a fortress site on the Karelian Isthmus in the summer of 1939. His suspicions are directed at the guests of a nearby guesthouse. Aarno Teräs an engineer leading the fortification site, and his bride Birgit Lahti get into trouble because of a band of spies and dancer Veronica Sorrento.

Arno is a painter having an idyllic summer romance with dancer Helja on the picturesque coast of North Estonia when an unexpected visitor appears – a well-off young woman Margot. She tempts Arno to join her to have a good time at a resort town. Helja stays where she is and starts missing Arno. Northern summer is short – but long enough in order to realize one's feelings.

After being harassed at the office by her boss, Eila gets sacked and tries to find a new job. After difficulties, she eventually begins to work as a model to a sculptor.

Tanja Bulkova arrives in Finland under the name Toini Salonen and, with the help of spy chief Rosenberg, becomes the secretary of engineer Rautavuori and discovers the drawings of a secret invention.

The old man at the Eirtola house warns the new maid Eriikka about the fate of Jenny, the summer girl. Jouko, a university student from Eirtola, arrives home for the summer and begins to court the pretty maid. At the cattle shed, Eriikka finds a box, the contents of which she examines together with Pastor Tuomo Ahomaa. The tragic fate of Jenny, the summer girl, is revealed.