After a break in at 10 Downing Street, it appears that the thief was only able to steal one of the African dolls from the Prime Minister's collection, and was not able to find the secret safe where Lord Devlin had hidden the top secret security plans. While Lestrade helps Greyson - who must interrupt his meeting with the famous recluse millionaire Lord Bork “ to retrieve the precious doll, Holmes and Watson conduct their own investigation. After all, Holmes believes that the safe was found, that the doll is just a decoy, and that Devlin himself is somehow involved. Holmes sets a trap to catch Devlin, discovering that Moriarty has been masquerading as Lord Bork! Though Moriarty gets away, the plans are recovered before and the doll is returned safely.