The Mystery of Marie Roget

The first body was wrongly identified as Marie Roget because its face was mutilated beyond recognition. Minister Beauvais quickly claimed it was Marie, but later investigation revealed the corpse actually belonged to Marcel's English wife, who had recently traveled to Paris to pursue her husband. Scotland Yard provided this information to Inspector Gobelin, solving the initial misidentification.

Marie reappeared after the body was discovered specifically to clear her own name and challenge Beauvais's claim that the corpse was hers. However, she refused to disclose where she had been during her disappearance, creating suspicion about her true activities and motivations.

The relationships formed a dangerous triangle: Camille was engaged to Marcel Vigneaux, but Marcel was secretly Marie's lover. Both Marie and Marcel were plotting to murder Camille to secure the inheritance that Cecile Roget stood to gain. This scheme drove much of the mystery's tension and the threat against Camille's life.

Dr. Paul Dupin infiltrated the morgue and removed the brain from the second faceless corpse to perform a forensic examination that would definitively identify the body. This bold, unconventional step allowed him to confirm the second body was indeed Marie Roget, pushing the investigation toward a more clinical, scientific approach.

Marcel confessed to killing Marie, claiming he did so to protect Camille from Marie's plot to murder her for the inheritance. However, this confession was complicated by the revelation that Marcel's English wife was actually the first body found, making Marcel's true motives and the circumstances of Marie's death murkier.

Dupin fabricated a story accusing Camille of possessing Marie's diary that did not actually exist. This ruse was designed to draw out the real killer, who would presumably try to retrieve or destroy such evidence. The clever manipulation successfully lured Marcel into revealing himself during the final confrontation at the Roget residence.

Beauvais appeared to challenge Inspector Gobelin's authority and demand the investigation be dropped, but the final revelation exposed that he had secretly been aiding Dupin throughout. His public opposition was apparently a cover to gather information without alerting the conspirators, though the full extent of his motives and what he knew about the murder plot remains ambiguous.

Beauvais's aggressive interference with the investigation initially seemed designed to protect Marie and block Gobelin's work.

Camille faced mortal danger because both Marie and Marcel had conspired to kill her. Their motive was financial: if Camille died before inheriting from Cecile Roget, the inheritance would pass to Marie as the next of kin. This inheritance scheme drove the murder plot against Camille throughout the film.

After Dupin removed the brain from the second faceless body at the morgue, he conducted a forensic examination that confirmed it was Marie Roget. This discovery, combined with Marie's second disappearance, led the investigators to realize Marie was dead all along and that her reappearance was part of the conspiracy's confusion tactics.

After Marcel confessed to killing Marie and charges were dropped due to Beauvais's intervention, Marcel challenged Dupin to a duel. This confrontation represented both a physical test of nerve and a symbolic duel of motives, reflecting the larger conflict between truth and manipulation that characterized the investigation.

Minister Henri Beauvais, a friend of Marie's grandmother, challenged Inspector Gobelin's authority and threatened to remove him from the investigation. Beauvais attempted to steer the inquiry away from trouble, though his true motivations remained unclear until the end when his secret collaboration with Dupin was revealed.