Though I was put off the by the rather rushed-in "Deus Ex Machina" of its ending and even a tad confused whether I was watching a comedy or a drama, the witty writing (the "Get me the colonel with the scrambled alphabet for a name on the phone!" springs to mind), I was pleasantly surprised at how at ease most of the cast seemed to be with the plot - makes me wonder if ad libs were prevalent in it - be it Roland Young as relaxed as he would be several years later opposite Cary Grant in "Topper", or even this unknown (to me, at least, but I'm sure to compensate that by chasing more titles with her in it) May Boley, whose clever and cheeky dialogues made up for a very subtle (though tongue-in-cheek) comedy relief. Both these two aforementioned performances would make me rate it 3 stars already.
But Pola Negri's dominant presence, alongside her vocal talent and even voice talent, as defied by her royal consort ("This holier-than-thou attitude is becoming more annoying than amusing") is what really makes this a joy to watch!
Anyway, without incurring into spoilers; to be perfectly honest, the shameless plot device described at the beginning of this review, is preferable, and even fits the surprises hidden in this production better than a "Mary of Scotland" sort of ending - as the same RKO studios would produce a couple of years later - and much more becoming to the latter, it must be said.