1880s London: As an American assassin struggles with her dead father’s vengeful spirit, a mysterious cult attempts to brainwash her into killing Queen Victoria.

In 1880's London, a mentally tormented American woman, brainwashed by a mysterious cult, plots to kill Queen Victoria.

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The cult has to succeed in brainwashing her. At least temporarily to motivate the plot.

I don't understand why this would be categorized as SciFi flick. What's the science entailed in the premise?