Intriguing South Seas "epic" about a couple of roughs and their casino girlfriends that decide to steal gold they believe a customer to have on his private island. Trouble is that the customer tricks the two men et al so they will find treasure underwater only to be lifted after completion of said job. This little, low-budget film was directed by that once shining star Edger G. Ulmer - the director of 1934's The Black Cat. Like all of Ulmer's work, flashes of brilliance resonate throughout. Ulmer makes the most with a small budget. That being said, innovative use of struggling finance and truly imaginative uses of actors and camera angles do not necessarily make for a great film. Here they struggle to do just that - but come up somewhat short. Nonetheless, because of the talent here, Ulmer, John Carradine, Gale Sondergard, and Sidney Toler, and a quick, zippy pace, and some campy dialog, etc..- Isle of Forgotten Sins is better than one could or should expect. The leads of Carradine and love-interest Sondergard go against type, and while Carradine is always a thick slice of ham - he is always fun to watch. Toler, Charlie Chan himself, has a great time playing a heavy in the film. The girls that accompany the men are all knockouts. The story is where weakness - rising damp if you like - sets in. While the two chummy roughs fight between themselves over Sondergard and whatever else they can, neither is heroic in any real sense of the word. They are bad guys. Toler is a bad guy. So pulling for one over the other was difficult, especially since Toler seemed far more pleasant company. The other thing is that the low-budget really shows its depths when the "boys" dive trying to find the gold. The diver in the water is obviously a toy, gesticulating with its hand in the same motion over and over again. The scenes just look ridiculous. The boat and some of the exterior shots of the hotel, etc... look like miniatures too. The climatic ending also is rather excessive, but interesting.