In Arthur Conan Doyle's Sherlock Holmes novels, there is a character named Lucy Ferrier, who is a Mormon girl featured in the novel "A Study in Scarlet." Lucy Ferrier's story is a central part of the novel's plot.

Lucy Ferrier was a young Mormon woman who, along with her father, John Ferrier, was rescued from the Nevada desert by a group of Mormons led by Brigham Young. After their rescue, Lucy and her father settled in the Mormon community of Salt Lake City. Lucy grew up in this community and became a devout Mormon.

As the story unfolds in "A Study in Scarlet," Lucy Ferrier's fate takes a tragic turn. Her father, John Ferrier, becomes a successful and respected member of the Mormon community. However, tensions arise when John Ferrier refuses to allow his daughter to marry one of the Mormon elders, a man named Brigham Young Jr. This refusal leads to a conflict between Ferrier and the Mormon leadership.

Ultimately, both John Ferrier and Lucy meet a tragic end. John is murdered, and Lucy, left vulnerable, meets a grim fate as well. These events serve as a pivotal point in the novel, leading to the investigation by Sherlock Holmes and Dr. John Watson.
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