In order to check the German offensive, Partizans send an elite team of explosive experts to blow up a strategically important bridge. Besides being heavily guarded, that bridge is almost indestructible and the only man who knows weak spots in the construction is the architect who built it. He is, however, reluctant to cooperate because he doesn't want to see his masterpiece destroyed.

Wife of a doctor, who's busy with his work over the top, lets herself to adventure. Much effort is needed to overcome "little" argues and to find the way of understanding and respect.

In January 1943 the German army, afraid of an Allied invasion of the Balkans, launched a great offensive against Yugoslav Partisans in Western Bosnia. The only way out for Partisan forces and thousands of refugees was the bridge on the river Neretva.