During a reception in a villa, wealthy banker Calandri is killed in the park with a gunshot. The gamekeeper Barra is immediately arrested, but he declares himself innocent. During the trial it turns out that the defendant had threatened the victim, guilty of courting his sister-in-law. But the deposition of a journalist present at the party soon leads to discover the existence of a dense network of equivocal relations between the victim, the guests and the servants. This judicial setting drama is allegedly the second Italian sound film after "The Song of Love", made using the RCA Photophone recording technique, and is also considered to be the first Italian detective film, a precursor to the later genre of Giallo films.

Renzo Ricci
as Aroldo Cramoli

Marcella Albani
as Leda Astorri

Carlo Ninchi
as Marcello Barra

Lia Franca
as Dora Bardi

Elio Steiner
as Giulio Alberti

Elvira Marchionni
as Cognata di Marcello

Giovanni Cimara
as Carlo Astorri

Camillo De Rossi
as Adolfo Calandri

Vasco Creti
as Giovanni, il cameriere di casa Astorri

Franco Coop
as Carlo Lirossi, il portiere di casa Calandri