- Jill is installed in a penthouse flat by Brian, her scientist boyfriend.
- Three women, posing as members of his family, come to the flat and threaten Jill's life unless Brian hands over top secret files.
- A fourth, "Brian's mother" goes away and notifies the police.
- But how does she know that "Brian's mother" is a fraud?
- The excitement is heightened by the interruptions of down-to-earth characters who provide counterpoint to the tense atmosphere of this thrilling drama with a twist in its tail.
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