Conway is Tom Martin, a private investigator asked to look into a matter of stamp counterfeiting.
This, of course, leads to several murders and Martin must hurry to solve the crime in order to apprehend the killers. This has been compared to both "The Saint" and "The Falcon" films which Conway also starred in for RKO.
It's not a bad little film but there are times it seems like a retread of those earlier films. Conway does his usual good job and this makes for a nice time waster.
I actually had never heard of this film until Sinister offered it. try it and see if you like it.