The Mormon girl in the Sherlock Holmes novel *A Study in Scarlet* is named Lucy Ferrier. She was the daughter of John Ferrier, a British doctor who was traveling through Utah in 1847 when he was rescued from death by a group of Mormons led by Brigham Young. The Mormons forced John Ferrier to convert to their faith and to marry Lucy to one of their leaders, either Joseph Stangerson or Enoch Drebber.

Lucy refused to marry either man, and she fell in love with a non-Mormon named Jefferson Hope. Hope helped Lucy escape from the Mormons, but they were caught and Lucy was forced to marry Stangerson. She died shortly after the wedding, apparently of a broken heart.

Hope vowed revenge on the Mormons, and he eventually tracked down and killed Stangerson and Drebber. He was then arrested by Sherlock Holmes, but he was eventually released due to lack of evidence.

Lucy Ferrier is a tragic figure in *A Study in Scarlet*. She is a victim of religious oppression and of the patriarchal society of the late 19th century. Her death is a reminder of the dangers of intolerance and of the importance of fighting for justice.
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