密みっ室しつ殺さつ人じん

noun

locked-room murder

Refers to a murder committed in a space that appears to have been sealed from the inside, with no obvious way for the culprit to have entered or exited. A staple trope in detective fiction.

• このミステリー小しょう説せつは密みっ室しつ殺さつ人じんを扱あつかっている。

  This mystery novel deals with a locked-room murder.

• 密みっ室しつ殺さつ人じんのトリックを解かい明めいするのが探たん偵ていの役やく目めだ。

  It is the detective's job to unravel the trick behind the locked-room murder.