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The Spare Key Fits the Morgue cover

Original book ideaPsychological thriller

The Spare Key Fits the Morgue

A locksmith receives the spare key she gave her missing sister. It opens a private mortuary drawer occupied by a stranger who is carrying tomorrow's appointment card.

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How it begins

My sister's spare key arrived in a padded envelope without her sister attached.

She had been missing for nine months.

I knew the key because I had cut it badly. A little flat on the fourth tooth. Tess had complained that I saved my best work for people who paid.

There was nothing else in the envelope.

I locked the shop, put the key on a blue ribbon and drove to the only building in town that used that particular blank.

The mortuary had changed its sign since I had repaired the back door. It now promised peaceful transitions in silver lettering.

Inside, a man was watering a plastic plant.

"Leonie," he said. "I wondered when you'd come."

I had never met him.

He set down the watering can before I could ask about it.

"Leaks overhead. Easier than explaining."

He gave me a visitor's badge and led me past a row of closed consultation rooms. The ribbon felt childish in my fist. Tess had chosen it years ago so I would stop losing things.

At the cold-room door, the man waited.

"I haven't said what I want."

"No," he said. "You haven't."

The key turned without resistance.

I had repaired that lock too, although I remembered a different door around it. Blue paint. A loading bay. Someone had moved the whole fitting.

The man pulled out the third drawer.

A stranger lay inside. Late fifties, perhaps. Carefully combed hair. A small white card rested in the clear bag beside his hand.

I read the appointment time first.

Tomorrow. Ten thirty.

Then I read the name.

Leonie Voss.

The man beside me took out a paper diary.

"Before you say anything, that's not the first time."

I looked back at the lock.

There were fresh scratches around the keyhole. Someone had tried the wrong key, repeatedly, before finding the right one.

My sister had never forced a lock in her life.

She had always known which door would open.

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Outline and characters

Develop this idea

For a missing-sister psychological thriller, make the locksmith's expertise essential. A key can establish access, wear, duplication and time, but it should not magically explain motive. Keep a visible inventory of doors so the reader can test Leonie's deductions. Give the sister a purpose of her own, including a reason she might resist being found. Your version could move the mystery to a hotel or archive, provided the protagonist's work still creates the clues and the final choice.

  1. Leonie receives her missing sister's spare key
  2. The key's unusual cut matches a private mortuary lock
  3. A drawer holds a stranger carrying a future appointment
  4. Gareth reveals that appointments have been entered under false names
  5. A second key opens a room emptied before Leonie arrives
  6. Her sister's old invoices expose a network of borrowed identities
  7. Leonie learns the stranger planned to expose a fraudulent death registry
  8. The mortuary owner offers information in exchange for silence
  9. Leonie uses the keys to establish which rooms were accessible during the murder
  10. She finds her sister alive but unwilling to return to her former name
Characters
  • Leonie Voss, 35. Locksmith searching for the sister who left her a key
  • Gareth Pike, 59. Mortuary assistant keeping an unofficial appointment book
Series possibilities
  • Gareth finds an appointment booked for a building demolished before he was born.

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