Five young people - brothers, sisters, cousins - are on vacation in the countryside. Pernette suggests to Marianne, who wants to be appreciated by her cousin Olivier, to make him jealous by inventing an aviator in love. At this announcement, Olivier bursts out laughing, but an airman knocks on their door, his private plane having had a breakdown. The mirage then becomes reality, and thanks to this unexpected visit many feelings will come to light.
