From the armistice of 1918, which marked the end of the First World War, to the declaration of war in September 1939, the beginning of the Second World War: an era during which there was an aspiration to create a new world, prosperous and at peace, but which provoked a new tragedy, seen through the destinies of thirteen people who were both actors and witnesses of the upheavals of the so-called inter-war period.

Scientists and sci-fi writers explore a hypothetical first-contact event between aliens and humans.