It seems that most IMDb reviewers have a pretty low opinion of "Background to Danger." Well, I admit that many of the criticisms of this film have merit. First of all, George Raft was decidedly not near the top of Hollywood actors. Second, there is, as many have observed, more than a little resemblance between this film and some others, such as "Casablanca." And I keep wondering what the film would have been like with Bogart, Cagney, or Garfield in the lead role.
Nevertheless, this is a film I have enjoyed many times and probably will again. Some of Raft's lines probably would not have worked with Cagney or Garfield, but they are okay coming from Raft. And, of course, the supporting cast is really excellent.
All in all, I think you will enjoy this film if you don't go in expecting something on the level of "Casablanca" or even that of "Sahara," a Columbia film of the same year starring Humphrey Bogart. In short, enjoy the fast pace and the really great support from Greenstreet, Lorre, Brenda Marshall and the others.