It feels so Wong but I know It's Right Another WONG MOD from MGM: THE MYSTERY OF MR WONG
In the second installment of the series Wong is asked to tackle the mystery of the theft of The Eye of the Daughter of the Moon, a golfball sized sapphire smuggled from China into the United States. There are several more Wong mysteries that have been available before in box sets but these MODs have been MGMs way of getting such films out as singles. Here's hoping they finish the series. The quality here is a good considering the age of the film. Other Karloff films in the Mr. Wong series include Mr. Wong in Chinatown (1939), The Fatal Hour (1940), Doomed To Die (1940), and The Phantom of Chinatown (1940).