Between the feelings of the man who believes himself to be deceived and of the surgeon's instinct, it is the latter which triumphs in Doctor Bernon, who saves the man presumed to be his wife's lover. He then realizes that this is not the case and that she is still worthy of him.

Fabienne believes herself to be cheated on by her husband Claude and divorces her. He leaves for America and does not return until eight years later. He then meets his daughter.

A time lord of Valois must go to war. He learns by a prophecy that his honor risks being affected. He entrusts his wife to Maxime de Falindor who, despite the temptation, will know how to restore her wife and honor intact.

Léontine, an old baroness, opposes her granddaughter's wedding for moral reasons. But Adolphe, her first husband reminds her that her own conduct in the past was far from irreproachable. Didn't she cheat on him ? And after her divorce from him and her remarriage with a baron, didn't she do the same thing to her second husband? Léontine then realizes she is in no position to lecture her granddaughter, all the more as she loves her fiancé truly.

On his wedding night with Hilda Bergmann, the daughter of a swedish chemist, the young and rich american Willy Keanton is stabbed by an unidentified masked man. He kidnaps the young woman, who is found later on by the count Robert d'Arbel. The detective Jacques Miral, nicknamed « the pointed tower's ferret » is put in charge of the case. Soon, he discovers that an international bandit, Méphisto, seeks to seize the formula of a process against asphyxiating gas, invented by professor Bergmann. The struggle is tough between Miral and the uncatchable Méphisto. Monique Aubray, Keanton's secretary and engaged to the detective, the Nostradamus stallholders and the « mastiff of Bordeaux », and the famous novelist Fortuné Bidon are also involved in the case...

La Possession is a 1929 French film directed by Léonce Perret.