During the Second World War, in 1943, two French prisoners, François and Michel, escape from Stalag B377 in northern Germany near the Baltic Sea. They meet another escaped compatriot, Pierre, who has donned the uniform of a German officer and joins them. Their goal: to reach neutral Sweden. To get there, they'll have to walk part of the way, then take a train to the coast and, from there, find a way to cross the sea to the shores of Sweden.

Pierre Fresnayas Lieutenant Pierre Keller, instituteur
François Périeras François, employé de commerce
Michel Andréas Michel, artisan ébéniste
Silvia Monfortas Wanda, une déportée polonaise
Georgette Anysas La travailleuse libre
François Darbonas L'oberlieutenant
Jacques Marinas Un prisonnier
Robert Rollisas Un prisonnier
Luc Andrieuxas Un prisonnier