Island of Lost Men (1939)

Island of Lost Men (1939) is a undercover cop exotica yellowface Teutonic expatriate adventure crime romp up the dark rivers of the racists century and hard into the orienticals in more ways than just the music and the music is bullying and harassing of a certain type of perfectly exampled nature of the era, for which engaging in ridicule as a proceeding was the tone of reckoning, even for horror, in its serious moments of introspection.

What is horror? It's a bit like being stuck in a watery hole, maybe as in The Deer Hunter (1978). The young Broderick Crawford finds out in Island of Lost Men (1939). Broderick Crawford may be the most film noir aspect of this non-noir branch reform of the form.

Impact (1949)

Impact (1949) is a film noir classic of confusion, plot twists, identity and love and follows the mishaps and fateful fortunes of industrialist Walter Williams, played by Brian Donlevy.

What makes Impact an impactful film noir as opposed to a plain old drama, is the twisted plot around the successful industrialist's marriage. 

As grouchy as an old bear, his wife sits around at home, the very epitome of the scheming wife, out for what she can get, and of course plotting murder.

A marriage made of monogrammed shirts and pyjamas is helpful for plots like this. Much is made of the bizarre accidentals which lead poor Walter Williams from the heights of success to the lows of small-town isolation, such as the odd device of the domestic assistant Su Lin (played by Anna May Wong) overhearing what she thinks is a threat, when in fact it's a husband larking around with his wife.

The duplicitous wife in Impact (1949) is here writ heavy in the form of Helen Walker, who plays the Irene Williams, the lady behind the plot to kill. Like a good deal of solid noir, Impact is a marriage fantasy, the likes of which 1940s film noir specialised in. 

By this we demonstrate a wife who is so ill-suited that she is planning your murder, and a wannabe love that turns up out of nowhere, already embodying the American dream, and valuing love above cash - a perpetual dilemma.