Plot Analysis Summary
A scientist's discovery of biological enlargement becomes a cycle of obsession, murder, betrayal, and monstrous destruction.
Story Structure — 5 Plot Phases
The Botanist Returns
Dr. Charles Decker returns from Africa after being presumed dead. He brings back a baby chimpanzee and reveals his interest in enormously enlarging living organisms.
Key Events
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Return From Africa — Decker returns from Africa after being presumed dead for a year. Characters: Dr. Charles Decker
Location: Britain
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Growth Method Revealed — Decker has discovered a way to enlarge plants and animals enormously. Characters: Dr. Charles Decker
Location: Africa
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The Chimpanzee Arrives — Decker brings a baby chimpanzee home as a test subject. Characters: Dr. Charles Decker
Location: Decker's home
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Serum Creates An Ape — The serum transforms the chimpanzee into a ferocious gorilla-sized ape. Characters: Dr. Charles Decker
Location: Decker's laboratory
Science Turns Sinister
Decker's growth serum transforms the chimpanzee into a dangerous ape. His discovery contributes to his loss of sanity and his decision to use hypnosis for murder.
Key Events
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Decker Loses His Sanity — Decker's experiments intensify as he becomes insane after discovering the serum. Characters: Dr. Charles Decker
Location: Decker's laboratory
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Hypnotic Control — Decker mesmerizes the ape and turns it into an instrument of murder. Characters: Dr. Charles Decker
Location: Decker's home
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Foster Becomes A Target — Decker sends the hypnotized ape toward Dean Foster. Characters: Dr. Charles Decker, Dean Foster
Location: London
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Tagore Becomes A Target — Professor Tagore is named as another academic target for elimination. Characters: Dr. Charles Decker, Professor Tagore
Location: London
Enemies In The Crosshairs
Decker targets Dean Foster and Professor Tagore because they possess greater scientific credit. His private scientific rivalry becomes a campaign of assassination.
Key Events
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Field Trip To The Woods — Decker takes a group of students on a field trip to the woods. Characters: Dr. Charles Decker
Location: Woods
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Improper Advance — During the trip, Decker makes an inappropriate advance to a student. Characters: Dr. Charles Decker
Location: Woods
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Boyfriend Confronts Decker — The student's boyfriend confronts Decker, who appears to concede. Characters: Dr. Charles Decker
Location: Woods
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Secret Strangulation Order — Despite appearing to yield, Decker sends the ape to strangle the boyfriend. Characters: Dr. Charles Decker
Location: Decker's home
Margaret's Retaliation
Decker's predatory behavior toward a student creates a new personal crisis. Margaret responds by hypnotizing the ape and administering an enormous dose of serum.
Key Events
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Margaret Sees The Betrayal — Margaret sees Decker ask a student to become his assistant and lover. Characters: Dr. Charles Decker, Margaret
Location: Decker's home
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Margaret Takes Control — Margaret hypnotizes the ape in an attempt to get even with Decker. Characters: Dr. Charles Decker, Margaret
Location: Decker's home
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Serum Overdose — Margaret gives the controlled ape an enormous amount of growth serum. Characters: Margaret
Location: Decker's laboratory
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Margaret Becomes The First Victim — The transformed ape kills Margaret as it becomes a colossal monster. Characters: Margaret
Location: Decker's home
The Monster Breaks Free
The ape becomes colossal, kills Margaret, and bursts through the roof. In the greenhouse it seizes Decker before armed soldiers stop its rampage.
Key Events
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The Roof Is Destroyed — The monster continues growing and bursts through the roof of the house.
Location: Decker's home
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Greenhouse Attack — The giant ape grabs Decker while a carnivorous plant seizes the student's arm. Characters: Dr. Charles Decker
Location: Greenhouse
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Armed Soldiers Attack — Heavily armed soldiers attack the giant monster and halt its rampage.
Location: Decker's property
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Decker Falls And The Ape Reverts — The ape throws Decker to his death, then falls and changes back into a baby chimpanzee. Characters: Dr. Charles Decker
Location: Decker's property