The Ace of Scotland Yard (1929) is a Universalmovie serial. It was the first partial sound serial released by Universal Pictures (although the sixty-ninth serial released including the silent serials).
Universal announced this as the first talking serial but that title is usually agreed to belong to Mascot Pictures' The King of the Kongo (1929). It was released in both sound and silent versions. The serial is presumed to be lost.
Retired CID inspector Angus Blake tries to catch a jewel thief named The Queen of Diamonds from stealing a valuable ring (which, according to legend, carries a curse) from Lord Blanton.