You know something is wrong, right from the beginning.
When Louis meets his bride-to-be, fresh off the boat on a remote island, she doesn't look like the picture she sent. Julie says she sent a picture of her sister in case she changed her mind about getting married.
When he drives her to his stately home, he confesses he lied to her too. He doesn't work in a factory. He owns the factory. He didn't want her to marry him just for his money.
This is the opening of Waltz Into Darkness, the 1947 novel by Cornell Woolrich, published under his pseudonym, William Irish. It plays beautifully in Francois Truffaut's 1969 film adaptation, starring Jean-Paul Belmondo and Catherine Deneuve.
With minimal changes to the novel's plot, the movie tells this classic noir tale of two people, doomed by their personal histories to play out a downward spiral of crime. The many lessons Truffaut learned from Alfred Hitchcock are on full display here.
The movie falls short of Woolrich's dark vision in only one way. Belmondo and Deneuve are just too attractive. In the novel, Louis is an aging bachelor, which helps justify his obsession with holding onto Julie. It's hard to imagine Belmondo being desperate to meet women.
In the novel, Julie falls in love with Louis, but cannot stop being the psychopath her circumstances in life have made her. It's hard to imagine Deneuve as anything but an angel.