Curse of the Fly

Martin Delambre drives to Montreal where he meets Patricia Stanley, a young woman running in her underwear. They fall in love quickly and marry, despite their deep secrets. Patricia has escaped from a mental asylum, and Martin and his father Henri are pursuing radical teleportation experiments with horrific consequences looming over them.

Patricia's asylum past shadows their new life as they settle into marriage. The Delambres operate a lab that teleports people between Quebec and London, but earlier attempts produced disfigured and insane victims. Martin's recessive fly genes force him to rely on a youth serum to slow his aging.

In a rambling mansion in rural Quebec, Martin and Henri conduct teleportation experiments between their estate and London. Previous failures left horribly disfigured inmates locked in the stables, a grim reminder of what the experiments can do. Judith, Samuels, and Dill are among the victims connected to the Delambre project.

Albert, Martin's brother, runs the London receiving station and has begun to doubt the project. He wants to terminate the teleportation program and escape the family obsession before it destroys them all.

The police and the headmistress of the asylum trace Patricia to the Delambre estate and confirm that she has married Martin. They also discover that Martin had a previous wife who was never divorced. Inspector Charas informs Inspector Ronet about the Delambre family and their experiments.

As investigators close in, the Delambres decide to abandon their work and erase the evidence by teleporting Samuels and Dill to the London lab. Samuels awakens during the transport and violently attacks Martin, threatening to reveal the project.

With Henri's help they subdue Samuels, but the plan goes wrong when they can't reach Albert. They teleport one of the assistants anyway, and Albert destroys the reintegration device, horrified by the writhing mass that would result and kills it.

Wan releases Judith to torment Pat, telling her that Pat is in Judith's room. Martin and Henri try to maintain control, and Pat fears she is losing her grip on reality as the truth about her marriage starts to surface.

Judith stalks Pat toward the lab; Tai tries to stop Judith and is forced to kill her in self-defense. Tai releases Wan and, to avoid a murder charge, teleports Judith's body away. Wan and Tai decide to leave the Quebec estate.

Back from another police interview, Henri convinces Martin to send the unconscious Patricia to London and then follow. Martin resists, but Henri volunteers to go first and is sent ahead.

Henri's teleportation attempt ends in failure as he does not rematerialize and is lost. Albert had destroyed the reintegration equipment earlier and disappears; Inspector Ronet arrives at the estate as Tai and Wan drive away.

Patricia awakens in the teleportation chamber and escapes before rematerialization. Martin, aging without his serum, dies soon after while pursuing her, eventually collapsing as a skeleton. Inspector Ronet finds him and escorts Patricia back into the house.