Did You Know?
The story is based on the story of Graham Young, known locally as The Bovingdon Poisoner.
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The film was not screened at many local cinemas, due to the tone of the film, and out of respect for the surviving victims, and the relatives of the dead.
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The movie does take some liberties: an example is that Young did not kill his Stepmother in real life - indeed he was close and devoted to her as she had a terminal illness. However, due to his sociopathic behavior, the film seems to explore the possibility he had a hand in her death.
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The "Newton's Diamond" that Graham is obsessed with is a fictional device. Antimony sulfide forms a crystal called stibnite which is gray and opaque, not clear and colorless like most gem-quality diamonds. "Diamond" was the name of Isaac Newton's dog.
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