The sole reason to watch this B-movie is the cast of veteran actors which includes George Zucco and Leo Gorcey, and who give the material more care than it deserves.
The plot concerns the "now we see it, now we don't" game thats played with the corpse of a murdered man. The man was a notorious killer who had been missing for five years before turning up near a wax museum. I won't spoil what happens since despite all the flaws can be quite entertaining if taken on its own terms.
The film suffers from two problems. The first is a cheapness that, while not truly bad, makes the wax museum seem more like a cardboard dive then a real place. The other problem is that the script, while containing funny lines, moves everyone around in a rather awkward manner as if they had to fill out several sections of the movie until its time to move to the next location. Neither problem is deadly, rather they are annoying in the "If they just didn't do that this would be so much better" sort of way.
If you should see this on TV or on the bargain video rack, by all means venture to dive in, since while its not the best of its type, its pretty damn good thanks to the great cast.