AllMovie

Filmed in England, the French-language 77 Rue Chalgrin was based on a stage melodrama by British playwright Walter Hackett. While the owner of a London townhouse is on a tour of Africa, a crook moves in and transforms the house into a seamy gambling den. One evening, a gorgeous young lady enters the establishment, escorted by a "man of mystery" whom we know to be the actual owner of the house. Rather than reveal his identity, he joins in the crooked revelry, all for the purpose of saving the girl's brother from a life of crime. But things don't quite work out that way, and before the story has ended there have been two murders -- one faked to fool the cops, the other all too real.