the plot thickens

Phrase

humorous idiomatic often

(idiomatic, often humorous) Used to describe an increasingly complex or mysterious situation.

Japanese Meaning

状況や物語がますます複雑になり、謎が深まる様子を表現する（しばしばユーモラスに用いられる） / 事態が複雑化し、予想外の展開をみせる様子を示す

When I found the second hidden letter in the drawer, the plot thickens.

引き出しで二通目の隠し手紙を見つけたとき、事態は一層複雑になった。

Sense（1）

(idiomatic, often humorous) Used to describe an increasingly complex or mysterious situation.

BAYES. Lo' you now, there he's off again.

JOHNS. Admirably done i'faith.

BAYES. Ay, now the Plot thickens very much upon us.