Netflix releases the first teaser trailer for Marie Kreutzer’s thriller “Gentle Monster,” starring Léa Seydoux. The teaser opens on seemingly ordinary home-video footage depicting a close-knit family, then shifts as unsettling developments intrude. Family members react to indications that something is wrong, and the trailer escalates with the arrival of authorities and accusations tied to the father/son-in-law.

Across outlets, the film is framed as a tense study of what people know—and fail to know—about loved ones. The story centers on Lucy Weiss, a concert pianist whose life unravels when the police come to arrest her husband. One outlet describes the dispute as involving “shocking crimes,” while another emphasizes the broader theme of secrets and dark home truths. Coverage also notes that the film moves through multiple languages and cultures, with characters speaking German, French, and English.

Some details vary by outlet, but all present the same core premise: a domestic facade collapses under criminal allegations, forcing the protagonist to confront trust, deception, and the consequences for her family. Additional cast members highlighted include Laurence Rupp, Jella Haase, and Catherine Deneuve, with the film featuring music by Camille.