A former boxer, now a down-on-his-luck private investigator, takes on a seemingly simple case of a missing woman. As he delves deeper, he uncovers a complex web of deceit, blackmail, and murder involving dangerous criminals and a glamorous nightclub singer. The investigation forces him to confront his own past and the morality of his actions.

While "The End of the Line" received a moderate reception upon its release, it has since gained a cult following among fans of British noir. Critics at the time noted its gritty atmosphere and some compelling performances, though some found the plot to be somewhat predictable. Modern appreciation often highlights its contributions to the post-war British crime film genre.

• Praised for its dark, atmospheric portrayal of post-war London.
• Diana Dors' performance as the femme fatale is a standout element.
• The narrative is considered a solid, if somewhat conventional, example of British noir.

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The film was shot on location in and around London, contributing to its authentic and gritty atmosphere.