Plot Analysis Summary
A babysitting assignment becomes a cycle of technological terror, violence, concealment, and inherited destructive behavior.
Story Structure — 5 Plot Phases
Death on the Front Steps
Phillip and Evelyn discover their maid dead and realize they need a new babysitter. Helen meets Susan at a discount market and accepts the job.
Key Events
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Maid Found Dead — The Collins couple discover their maid dead with a broken neck at the end of the steps. Characters: Phillip Collins, Evelyn Collins
Location: The Collins front steps
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Babysitter Needed — The parents need a new babysitter for an upcoming party. Characters: Phillip Collins, Evelyn Collins, Susan Collins, Mark Collins
Location: The Collins home
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Helen Meets Susan — Helen meets Susan at the discount market and immediately likes her. Characters: Helen Giles, Susan Collins
Location: A discount market
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Babysitting Offer — Helen offers to babysit Susan for the Collins family's upcoming party. Characters: Helen Giles, Susan Collins
Location: A discount market
A House Under Control
The Collins parents leave Helen with Mark and Susan. Mark's technical ability and electronic tricks transform an ordinary babysitting assignment into psychological terror.
Key Events
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Parents Leave — Phillip and Evelyn leave Helen alone with Mark and Susan. Characters: Helen Giles, Mark Collins, Susan Collins, Phillip Collins, Evelyn Collins
Location: The Collins home
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Mark's Technical Setup — Mark's technical skill becomes the means for manipulating the household. Characters: Mark Collins, Helen Giles, Susan Collins
Location: The Collins home
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Electronic Terror Begins — Mark uses electronic tricks to psychologically terrorize Helen. Characters: Mark Collins, Helen Giles
Location: The Collins home
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Susan Is Terrorized — Mark extends his psychological harassment to Susan while Helen is present in the house. Characters: Mark Collins, Susan Collins, Helen Giles
Location: The Collins home
Revenge Arrives Armed
Williams enters the Collins home seeking revenge for the earlier science-class injury. Mark answers the confrontation with a fencing sword and kills him.
Key Events
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Williams Seeks Revenge — Williams arrives at the Collins home seeking revenge for being burned by Mark in science class. Characters: Williams, Mark Collins
Location: The Collins home
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Fencing Sword Drawn — Mark uses a fencing sword during the confrontation with Williams. Characters: Mark Collins, Williams
Location: The Collins home
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Williams Is Killed — Mark kills Williams with the fencing sword after Williams comes for revenge. Characters: Mark Collins, Williams
Location: The Collins home
The Fatal Defense
Mark's harassment continues while the parents remain away. Helen finally defends herself and knocks Mark onto his spiked German helmet, killing him.
Key Events
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Household Terror Escalates — With the parents still absent, Mark's technical harassment continues to endanger Helen and Susan. Characters: Mark Collins, Helen Giles, Susan Collins
Location: The Collins home
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Helen Defends Herself — Helen physically defends herself when the conflict with Mark reaches a dangerous point. Characters: Helen Giles, Mark Collins
Location: The Collins home
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Spiked Helmet Falls — Helen knocks Mark onto his spiked German helmet during the struggle. Characters: Helen Giles, Mark Collins
Location: The Collins home
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Mark Dies — Mark is killed when he lands on the spikes of his German helmet. Characters: Helen Giles, Mark Collins
Location: Upstairs in the Collins home
A New Listener
The parents return to the ruined house, and Evelyn blames Helen while Phillip delays immediate arrest. Susan secretly adopts Mark's glasses and music, suggesting the cycle continues.
Key Events
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Parents Return — Phillip and Evelyn return to find the house in shambles. Characters: Phillip Collins, Evelyn Collins, Helen Giles, Susan Collins
Location: The Collins home
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Evelyn Blames Helen — Evelyn blames Helen for the disorder and tries to have her arrested. Characters: Evelyn Collins, Helen Giles
Location: The Collins home
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Phillip Searches Upstairs — Phillip looks through the children's rooms and presumably finds Mark's body. Characters: Phillip Collins, Mark Collins
Location: The children's rooms
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Ride Home Offered — Phillip offers Helen a ride home and refuses to have her arrested immediately. Characters: Phillip Collins, Helen Giles
Location: The Collins home
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Helen Refuses the Ride — Helen turns down Phillip's offer and drives back home herself. Characters: Helen Giles, Phillip Collins
Location: Outside the Collins home
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Cleanup Agreement — Phillip suggests that he and Evelyn clean up the damaged house. Characters: Phillip Collins, Evelyn Collins
Location: The Collins home
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Susan Takes Mark's Glasses — Susan secretly puts on her late brother's glasses. Characters: Susan Collins, Mark Collins
Location: The Collins home
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The Cycle Resumes — Susan listens to Mark's Nazi music, implying that his destructive pattern may begin again. Characters: Susan Collins, Mark Collins
Location: The Collins home
One evening the Collins find their maid Mrs. Murdock at the end of their steps: dead, neck broken. Obviously she had an accident. Consequently they need a new babysitter for an upcoming big party. The sensible Helen meets little Susan Collins at the discount market and likes her, so she offers to do the job. She doesn't know Susan's teenage brother Mark - technically skilled and good in school, but restive and cunning. As soon as the parents have left, he starts psychologically terrorizing Helen and his sister with electronic tricks.