noun
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.