感謝版友們的回覆。我用大家提到的關鍵字neo-noir查了一下，在英文的wikipedia上
的說明如下：（恕原文複製貼上，找不太到中文資料）
Neo-noir (English: New-black; from the Greek neo, new; and the French noir,
black) is a style often seen in modern motion pictures and other forms that
prominently use elements of film noir, but with updated themes, content,
style, visual elements or media that were absent in film noir of the 1940s
and 1950s.
The term film noir (French for "black film") was coined by critic Nino Frank
in 1946, but was rarely used by filmmakers, critics or fans until several
decades later. The classic era of film noir is usually dated to a period
between the early 1940s and the late 1950s. Typically American crime dramas
or psychological thrillers, films noir[a] had a number of common themes and
plot devices, and many distinctive visual elements. Characters were often
conflicted antiheroes, trapped in a difficult situation and making choices
out of desperation or nihilistic moral systems. Visual elements included
low-key lighting, striking use of light and shadow, and unusual camera
placement.
硬要翻譯，好像可以把neo-noir翻成「新‧黑色電影」，在noir film中加入了一些
比較現代的主題、風格、和視覺效果。Noir film通常是犯罪片/心理驚悚片，
角色常常是反英雄，被困在艱難的處境中，做出一些絕望、無奈的選擇。
電影色調暗、高反差，光影效果突出等。
這樣看來，nior / neo nior的影片已經不多了，如果再加上和「偵探」相關，
那必然更加稀少。英文維基「List of neo-noir titles」的條目下有列一些片單，
有些我看過，根本和偵探無關，只是電影的劇情和拍攝風格被歸在neo nior類型。
看來好像「冷硬派偵探片」真的比較少見。