in medias res

US /ɪn ˌmiːdiəs ˈreɪs/
UK /ɪn ˌmiːdiəs ˈreɪs/
"in medias res" picture
1.

倒敘, 從故事中間開始

into the middle of a narrative or plot without a preamble

:
The novel begins in medias res, with the protagonist already in a desperate situation.
小說以倒敘開始,主人公已經身處絕境。
Many epic poems use the technique of starting in medias res.
許多史詩都採用倒敘的開篇手法。