While some are better than others, pretty much all of the Saint films starring George Sanders are watchable at least once, even the lesser efforts. 'The Saint's Double Trouble' is a contender for the weakest of the series, and somewhat of a let-down after one of the best of the series with 'The Saint Takes Over'.
There are good things here. The sets are suitably atmospheric, it is one of the better looking films of the series and jauntily scored. The best thing about the film is Sanders, not just playing the title role but also his criminal double. He is super-suave, sophisticated and wonderfully caddish, while also giving a charming and humorous edge and delivering some cutting lines with aplomb.
Jonathan Hale is also very good, while the ending is effective.
On the other hand, the script is a complete mess and is enough to bring the film down more than one notch. It is just too underdeveloped and has too many loose ends, with a lot of corn and very little mystery. The story is also one of the series' least involving, it fails to maintain momentum and gets needlessly over-complicated with very few twists and turns.
It is interesting for featuring Bela Lugosi, who tries to depart from his horror roles to prove that he could do more than that. However he makes very little impact in a role with nothing to it whatsoever, a real waste. The characters are just not interesting at all and sometimes confusingly written.
In summary, a contender for weakest of the Saint films with Sanders. Sanders and Hale are fine but the script and story certainly aren't and bring the film down significantly. 5/10 Bethany Cox