In Montmartre, prostitutes and neighborhood pimps meet in Victor's bar. One of them, Charly, one day falls in love with the beautiful Laurence, a girl who honestly earns her life as a singer. But Fernand, the local boss, sees a bad eye his acolyte out of the ranks to lead a quiet life in the company of his sweetheart. He provokes the jealousy of Jessy, mistress of Charly. The latter, stung, does not intend to leave without fighting his lover take the tangent. She ruminates her revenge so much that she ends up shooting Charly ...

A series of crimes is being perpetrated around a famous singer. Strangely, during each of the crimes, the artist's voice is heard humming his favorite song. Suspicions lead to a chase through a nocturnal Paris, ending in a disused theater where the assassin has lured his final victim.

Arlette thinks she has made a wonderful gift to her daughter Sylvie, who has just married François Morel, a young journalist. And, to tell the truth, not everybody receives a posh little bar like the Royal Montmartre as a gift. The trouble is that Monsieur Jo, the former owner of the joint is also the boss of a gang of drug traffickers. And that he has managed to persuade the pair of naive lovebirds to drop a painting to a friend on their way to their honeymoon place. Now the picture is stuffed with drugs! The honeymoon trip promises to be eventful...

Fantômas is a man of many disguises. He uses maquillage as a weapon. He can impersonate anyone using an array of masks and can create endless confusion by constantly changing his appearance.