Doesn't hold up well in comparison to the other "Lone Wolf" movies. Ron Randell is lively enough but he has a tough job trying to follow up ultra-suave Gerald Mohr and ultra-charming Warren William in an established series. Talented Alan Mowbray appears a bit uncomfortable but is still watchable. William Frawley of course is his usual gruff persona and is very effective as a policeman. He is really good in this movie, but wasn't he always?
I realize that this is a "B" movie but it lacks the gloss that the Gerald Mohr Lone Wolf films have (they were also B-movies but have a high level of gloss with good cinematography, lighting, etc.) And of course this movie can't hold your attention the way the Warren William films can, some of which were really well-made.
If you are a Lone Wolf fan you will still get the same successful formula and the usual jewel-thief plot that you are looking for. From this standpoint a Lone Wolf fan could possibly find this movie rewarding.