Tiny, ultra-low budget PRC made three Philo Vance movies in 1947. While "Philo Vance's Gamble" was the third one released, it was the second one they made....which must have confused a few folks since the final installment (which appeared second) starred a different actor. Now considering they were made by PRC, they aren't that bad...I certainly expected much worse!
The story concerns a stolen emerald and folks who are associated with it suddenly dying. Vance is pulled into the story when the low-life trying to sell it tries to hire him and ultimately he's able to figure out who's killed who.
While this film is very simple and far from great, it is mildly interesting and reasonably well written. For fans of B-mysteries, it's worth seeing. For everyone else, it's a time-passer at best.