Take One False Step (1949)

Take One False Step (1949) is an innocent-man-accused murder mystery comedy-toned film noir by Chester Erskine, which follows decent upstanding citizen Andrew Gentling (played by William Powell) as he negotiates the criminal backdrops of San Francisco, trying to clear his name from the frame, and deal with a rabid dog bite in the process.

In town for a conference, Powell's character bumps into an old flame in the form of Shelley Winters, and she relentlessly hits on him until he drives her home, and she disappears, leaving him suspected of murder.

It's a murder without a body however, and an ordinarily tense noir setup falls into place and the hacks of film noir will argue that it winds up lacking in the tension that is traded for comedy.

The Flying Saucer (1950)

The Flying Saucer (1950) is a film perennially and erroneously filed as science fiction, despite the fact that the movie is as much in the action and adventure and romance film noir style of its day — as it is anything else.

With its bizarre chain smoking hero and elite Washington power brokers, its blockish tropes and violence, there is not a hella lot of science with this fiction but there is plenty Alaskan wilds travelogeurie and nature adventuring, including no end of aerials, with a fat deal of picnicking romance style fun and longing to a melodramatically marital soundtrack. 

In between these is a stab at an espionage story, with the notion being the playboy hero.

The Flying Saucer does suddenly forget itself from time to time but it surely identifies as noir. It must be the only science fiction with a film noir voiceover when it wants it.