1958
When you usually read about this series in guidebooks the reviewer ultimately states that J. Carrol Naish was badly miscast. But if you compare this with the serial 'Batman' (1943), then you will notice that even though the two parts of Charlie Chan and Dr. Tito Darka are different, in that one is good and the other bad, for some strange reason Naish played them the same. Maybe this is why the reviewers say this or maybe it was the reason he was cast as Charlie Chan in the first place? The location is Venice, Italy. Where someone has sold a vast amount of jewelry that is to be taken safely to the new owners, but the seller is really Pietro Monti in disguise. Pietro later tells Chan that he is only doing this to save his brother Victorio from the gangs, but in reality it's to alibi himself and to get rid of his gang members who are his opposition. Chan catches him in the end. Been an early ITC/TPA co-production it's very low budget with loads of stock footage, it okay to watch but the best thing about it is that it's over in 25 minutes.