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The plot concerns a comet hurling toward Earth on a collision course and the different reactions to people on the impending disaster.

The story of balladistic intonation takes place at Lake Balaton, in a fisher village. The love of Kovács Mária and Szabó Mihály is hopeless due to a long animosity between their families. Mária is married by her father to his adopted son Kovács Jani. The unhappy young woman is unable to hide her love for Mihály and therefore her angry father sentences her with the traditionally suitable penalty of unfaithful women, she is put on the stormy waters of Balaton in a boat without oars or scull.

A young man in love with a married woman takes the husband's place in the barracks and finds his rival there. But the fact that there are two Champignols in the ranks gives rise to many misunderstandings. But the husband preferring his painting, willingly abandons his pretty wife to the lover.

Vautier, a wealthy surgeon in his fifties, falls in love with Hélène, a young woman from a modest background. He allows her to have a string of short-lived lovers - but when Jean Trapeau, an old boyfriend, resurfaces, things get complicated.

Clairette learns that Bérénice, a former mistress, is pursuing her husband in the army where he is recalled. She puts on the sergeant's uniform and after a few entanglements reconciles with her husband while Bérénice consoles herself with the captain.

A woman's marriage is on the rocks ; to avenge herself, she decides to take a lover for one night .So she buys all his stock from a balloon man and flies them through the Parisian sky ; all her balloons carry a message :"I will be alone after midnight" (hence the title); a lot a suitors comme to the rendezvous : a fisherman, a soldier, a traveler , a gentleman cambrioleur (a nod to Arsène Lupin?) and others ,much to Michel, a young man in love with her's displeasure.

A hero of the Paris streets is recruited for a conspiracy against Mazarin in the court of the King, but he reveals the subversive plot to Anne of Austria.

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.

Claire and Jean are lovers, but Claire's father opposes this union, because Jean is the son of a woman he once knew. Jean becomes a great singer, but doesn't forget Claire.