locked room trick; closed room trick
Used in mystery fiction for a crime that appears to have been committed in a sealed space with no apparent exit. The term is a compound of 密室 (locked room) and トリック (trick).
See also: トリック
このミステリー小説の密室トリックはとても巧妙だ。
The locked room trick in this mystery novel is very ingenious.
密室トリックの謎を解くのが探偵の腕の見せ所だ。
Solving the locked room trick is where the detective shows their skill.
Compound of 密室 (locked room) and トリック (trick, from English). The term is a modern coinage used in mystery fiction criticism and fandom.