1x8 - The New Scooby and Scrappy-Doo Show

The gang goes to Blake Manor for a vacation, and gets there in time for the costume party, where Mr.Blake will be auctioning off a valuable stamp worth millions. But there is a cat burglar, the Masked Manx, on the loose, who leaves an ace of spades in the place of every item he steals. Can the kids stop him and save the stamp?