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Cover of The Parasite: A Story

The Parasite: A Story

Written by Arthur Conan Doyle

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About this book

"The Parasite: A Story" by Arthur Conan Doyle is a fictional tale written in the late 19th century. The narrative revolves around Professor Austin Gilroy, a dedicated physiologist, who is drawn into the mysterious and perplexing world of psychic phenomena, particularly through his interactions with the enigmatic Miss Helen Penclosa, who exhibits clairvoyance and mesmeric abilities. The story explores themes of psychology, skepticism, and the thin line between science and the supernatural. The opening of the story introduces us to Professor Gilroy, who describes the invigorating arrival of spring and reflects on his scientific pursuits. He is skeptical of the work of his friend, Professor Wilson, who is fascinated by psychology and mesmerism. As the professor reluctantly attends an evening demonstration involving Miss Penclosa, he witnesses phenomena that challenge his materialistic beliefs, particularly when his fiancée, Agatha, becomes a subject of Miss Penclosa's experiments. Gilroy's journey into the realm of the unknown begins, setting the stage for an intense exploration of love, obsession, and the potential dangers of unacknowledged powers. As the narrative unfolds, the stakes rise, revealing a conflict between the professor's rational mind and the potent, inexplicable forces at play, suggesting a thrilling psychological drama lies ahead.

Reading guide

Themes, characters and key ideas in The Parasite: A Story, written by Chaptra AI.

  • about 8 hours
  • intermediate
  • mysterious
  • psychological
  • tense

Arthur Conan Doyle's "The Parasite: A Story" plunges Professor Austin Gilroy, a staunch physiologist, into a terrifying encounter with the supernatural. Initially skeptical of psychic phenomena, Gilroy finds his rational world shattered by the enigmatic Miss Helen Penclosa, a woman possessing potent clairvoyant and mesmeric abilities. As Penclosa's influence over Gilroy and his fiancée, Agatha, intensifies, the narrative transforms into a chilling psychological drama exploring the dangerous intersection of science, mysticism, and obsession. Gilroy's desperate struggle to reclaim his free will and protect Agatha from Penclosa's insidious control forms the heart of this unsettling Victorian novella.

"I had always prided myself upon being a man of science, a man of facts, a man of reason. But reason, I found, was a fragile shield against the unknown."

Key themes

Skepticism vs. The Supernatural
This is the central thematic conflict of the novella. Professor Gilroy, a staunch materialist, represents the scientific skepticism prevalent in the late 19th century. His encounters with Miss Penclosa's mesmeric powers force him to confront phenomena that defy his rational explanations, challenging his entire worldview and the perceived limits of science.
Obsession and Control
The novella deeply explores the destructive nature of obsession, particularly Penclosa's fixation on Gilroy, and the terrifying implications of one person's mind controlling another's. Penclosa's desire for Gilroy quickly escalates from infatuation to a parasitic, manipulative control that strips him of his autonomy.
The Dangers of Unacknowledged Power
The story highlights the perilous consequences when extraordinary abilities are wielded without ethical restraint or understanding. Penclosa's mesmeric powers, while initially presented as a curiosity, become a weapon of psychological terror due to her malicious intent and lack of self-control.

Worth discussing

How does Professor Gilroy's scientific skepticism evolve throughout the story? What does his journey suggest about the limits of empirical science?

Chapter-by-chapter breakdowns, character arcs and the full thematic analysis come with a free account.

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