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The Locked Room Was My Idea cover

Original book ideaPsychological thriller

The Locked Room Was My Idea

An escape-room designer discovers a real murder staged inside a room she never agreed to build. Its puzzles describe the childhood home she has spent twenty years refusing to enter.

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How it begins

Iris recognized the room before she recognized the body.

The wallpaper was wrong, but the door stood three inches too far left. Her father had moved it himself, complaining about the beam, and spent the next winter catching his shoulder on the frame.

Nobody should have known that.

The photographs had arrived from a detective at eight seventeen. By eight twenty, Iris had stopped drinking her coffee. By eight thirty, she was in a taxi to an industrial estate she had never visited.

Leon Ames met her outside unit twelve.

“You designed this?”

“No.”

“Your name is on the invoice.”

“It isn't on the work.”

He let her through.

Inside, someone had built a small house beneath the warehouse roof. A front step. A narrow hall. The kitchen where her mother had kept a radio beside the sink.

Iris stood on the threshold and counted the floor tiles.

One, two, three. The fourth had always been loose.

This one moved beneath her shoe.

Leon watched her face.

“When did you last come here?”

“I've never come here.”

“To the original house.”

“Twenty years ago.”

He opened a folder. The victim's photograph showed a man she did not know lying beside a locked interior door. Above him, someone had fixed a brass plaque.

FINAL ROOM.

Iris looked down the hall. The kitchen should have been on the right. The stairs should have ended at a cupboard. Beyond that cupboard had been a space her family called the wall.

“What is behind the last door?” she asked.

“We haven't opened it.”

“Why?”

“The lock is part of a timed mechanism.”

Iris walked past him and knelt by the loose tile.

Her father had always said a good house held no secrets.

Beneath the tile lay a small key and a photograph she had once watched him burn.

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Outline and characters

Develop this idea

Keep a clear distinction between a commercial escape room and an actual confinement crime. Readers should understand exits, emergency systems, and why the unauthorized room lacks normal safeguards. Iris's childhood history must be seeded through concrete layout details. Avoid making the solution depend on a memory that suddenly becomes perfectly reliable. Pair recollection with physical evidence and let her reject the perpetrator's intended emotional script.

  1. Iris receives photographs of an unauthorized build.
  2. A dead man lies in its final chamber.
  3. The floor plan reproduces her childhood home.
  4. A client account uses a dead relative's identity.
  5. Leon finds a clue absent from police records.
  6. Iris discovers her earlier design files altered.
  7. The builder intended a witness to survive.
  8. A second room reveals a hidden exit.
  9. Iris breaks the puzzle's expected sequence.
  10. Physical evidence corrects the family's old account.
Characters
  • Iris Cole, 35. Escape-room designer
  • Detective Leon Ames, 44. Investigator familiar with her old case
Series possibilities
  • Iris uses spatial design to investigate constructed scenes while refusing to turn trauma into entertainment.

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