A young girl, Gaby, advertised in a newspaper to find a husband. Berthier, director of a telephone exchange, answered it. Yvonne, a charming telephone operator, has been invited by a subscriber, Vanetti, a married man looking for entertainment in the absence of his wife. The four young people have agreed to the same meeting place and will find the wrong partner. Gaby will spend the evening with Vanetti and Yvonne with Berthier.

Brussels in the year 1568, as the Flemish people are fighting against the tyranny of the Spanish occupiers. Led by Count de Rysoor, the revolt against the ruthless Duke of Alba, is meant to help Prince William of Orange to get into the city and come to power. Now, the count's lieutenant, has an affair with Elisabeth, Rysoor's wife. For the time being, the count, who thinks of his homeland first, turns a blind eye. But such a relationship might well undermine the whole rebellion movement.