Leslie Charteris' series of novels of the adventures of the slightly shady Simon Templar ("The Saint") was brought to the screen in the late 1930s with the up and coming George Sanders as Templar. It was a careful choice - Sanders usually would play villains with occasional "nice roles" (ffoliott in FOREIGN CORRESPONDENCE, the title hero in THE STRANGE CASE OF UNCLE HARRY, the framed "best friend" of Robert Montgomery in RAGE IN HEAVEN). Here his willingness to bend the rules and break a law briefly fit his "heavy persona", while his good looks and suave behavior made Templar a fit shady hero like Chester Morris' "Boston Blackie", and (to an extent) Peter Lorre's "Mr. Moto".
The films are not the best series of movie mystery serials - but they are serviceable. Like Rathbone's Holmes series or Oland's Chan's series the show frequently had actors repeating roles or playing new ones (the anti-heroine in the film here was played by Wendy Barrie, who would show up in a second film in the series). This, and slightly familiar movie sets make the series a comfortable experience for the viewers, who hear the buzz of the dialog (always showing Sanders' braininess in keeping one step ahead of the bad guys), without noting the obvious defects of the plot. All these mysteries have defects due to the fact that even the best writers of the genre can't avoid repeating old ideas again and again and again.
Here the moment when that happened was when one of the cast admitted his affection for Barrie, which she was long aware of. Shortly after he tries to protect her from the police. But as the film dealt with the identity of a criminal mastermind, it became obvious that this person was made so slightly noble as to merit being the mysterious mastermind (i.e., the script disguised him as the least likely suspect).
Barrie is after the proof that her father (who died in prison) was framed by the real criminals in a robbery gang. She has several people assisting her - mugs like William Gargan - and she gets advice from the mastermind on planning embarrassing burglaries that can't be pinned on her. The D.A. who got her father convicted (Jerome Cowan) is determined to get Barrie and her gang. The only detective who seems to have a chance to solve the case is Jonathan Hale, who is shadowing Sanders but reluctantly working with him.
The cast has some nice moments in the script - Hale (currently on a special diet) is tempted to eat a rich lobster dinner made for Sanders by Willie Best. He gets a serious upset stomach as a result, enabling Sanders and Barrie to flee Sanders' apartment. Best has to remind him (when he feels better) to head for a location that Sanders told him to go to at a certain time.
There is also an interesting role for Gilbert Emery. Usually playing decent people (like the brow-beaten husband in BETWEEN TWO WORLDS) he plays a socially prominent weakling here - whose demise is reminiscent of that of a character in a Bogart movie.
On the whole a well made film for the second half of a movie house billing in 1939. It will entertain you even if it does not remain in your memory.

***THIS POST CONTAINS SPOILER(S)***
I'm not a big fan of Chuck Norris as an actor, but I worship him in all other ways. He also have his own fan web site with "Chuck Norris facts" that is really entertaining. But this movie looks like someone was joking with the audience putting all those "facts" into one movie. I really don't remember when I wasted my time more than with this "action". I don't know what's the worst this movie can offer you: unoriginal and thousand-times-made plot of terrorists who are trying to nuke US by smuggling nuke on US soil or perhaps that "great" dialogs and Chucks words of wisdom about life and everything else. Someone may find the worst that terrorists actually speak English in everyday life. It's a never ending list of crap. Not to mention huge amount of archive footage used in film, that is kinda annoying. The chief terrorist send his comrades message through the media when he is captured and the only guy smart enough to see the treat is: Chuck Norris, of course. NO ONE else in America is not smart enough to see that! And the whole action in capturing chief is just ridiculous. One man is sent to walk through a whole terrorist camp UNARMED (I'm lying, he had a KNIFE), escapes his stalkers with JET PACK and then para glides for few hundred, maybe even thousand kilometers to nearest shore (Afganistan border is 450 km far away from nearest shore), where he is rescued by submarine. I hoped that at least fighting scenes will be good, but that's even more funny than the plot. If you didn't know, 85% of terrorist are masters of some martial art, but Chuck and CO beat the sh*t out of them. Not only they kill them easily, they can kick and throw them away by a single move and the bad guys fly few meters like dolls. You may ask me did I watch this movie to the end? I did. Why? Because I just wanted to see who, of these two super heroes, will defuse the nuclear bomb of few hundred megatons and size of a MICROWAVE. And then I realized what fool I am. Of course, it's Chuck's movie after all. And not only he singlehandedly defuse nuke with tweezers, but he do it - TWICE!! I could write a book about all the stupid things in this movie, but I would spend my life spawn.
So, makers of this movie made another Chuck Norris fact to be added on his web site: Can Chuck Norris defuse nuclear bomb? Yes and he can do it twice!