Francinalp

As the red headed boy writes in his school book, a family is a group living under the same roof who can't stand each other.

Passing for crazy and locked up, the CEO of a company escapes from the asylum and claims that he is the captain of a troop of pirates. To the disappointment of the director of the company and in the company of three employees, he accomplishes many extravagances which will be beneficial for his acolytes.

Rather than commit suicide, it is better to stay at the clinic of Professor Patureau-Duparc. This practitioner experiments on his clients with a serum that modifies their personality. Thus Yolande and Albert become new Romeo and Juliet. They end up marrying each other after having regained their primitive selves. Their married life is then a hell and they welcome with joy the proposal of a new injection of serum.

Laura has lost her fiancé. Immediately after, an accident happens to her and she becomes blind. Eve, her sympathetic sister, and an understanding doctor imagine having a newcomer, Marcel, play the delicate role of the missing fiance, because their voices are identical. Laure marvels and regains a taste for life. But Marcel falls in love with Eve.