How did The Blue Dahlia use film noir style and a murder mystery?

Directed by George Marshall, The Blue Dahlia (1946) exemplifies the film noir style by capturing the post-World War II sense of disillusionment and uncertainty. The film reflects the era's cynicism through the story of a navy veteran who returns home to find that the society he fought for has become modernized, heartless, and indifferent to corruption and organized crime.12

The film’s murder mystery plot serves as a vehicle for these noir themes. After the protagonist, Johnny Morrison, discovers his wife is having an affair and subsequently leaves her, she is found murdered. Johnny becomes the primary suspect, forcing him to navigate a claustrophobic and dangerous environment to clear his name. The narrative features classic noir elements, including a mysterious woman, a war buddy struggling with memory loss due to injury, and a web of suspicion surrounding a nightclub owner. While the screenwriter, Raymond Chandler, originally intended for the veteran character to be the killer, the ending was altered due to objections regarding the portrayal of wounded servicemen, ultimately revealing the house detective as the culprit.1