- Boston Blackie Dawson gets some jewels that belonged to the imperial family of Russia. A gang of terrorists is after the jewels.
- Reformed crook, Boston Blackie Dawson, accidentally comes into possession of the Romanov jewels, which the Grand Duchess Tatiana and her friends have brought to the United States for safety. Terrorists in search of the jewels transfer their attention to Dawson, but he is able to capture them with the aid of new electronic equipment and to expose Count Ivan as their leader. When Dawson gives paste copies to the U. S. Government, which also seeks the smuggled jewels, and returns the originals to their owner, Tatiana and Count Orloff are free to find happiness.—Pamela Short
- During the Russian revolution, Petrus rises to power and attempts to capture the Romanoff diamonds. The Grand Duke Alexis gives the jewels to the Grand Duchess Tatiana. Michael, a faithful servant to the family, along with Count Alexis Orloff, sweetheart of the Grand Duchess Tatiana, devise a plan to bring both the jewels and the Grand Duchess to the United States. Petrus and the renegade Count Ivan, who wants both the jewels and Tatiana, follow them to America. Michael, disguised as an old blind beggar, is walking along the street outside a restaurant when "Boston Blackie" Dawson and his wife Mary emerge after dining. As Blackie hands a coin to the beggar, Michael thrusts a bag of jewels into Blackie's pocket. Shortly thereafter Michael is run down. Detective Huck Kant discovers a piece of paper in Michael's hand, bearing the license plate of Blackie's car. Knowing Blackie was once a crook, Kant suspects he has returned to crime, and sets out for Blackie's home. Meanwhile, Petrus and his spies have already traced the diamonds to Blackie. Blackie waits at home, but prepares a trap. Petrus attempts to hold him up and threatens to torture Mrs. Dawson unless Blackie reveals where the diamonds are. Blackie points to the safe on the mantelpiece. When the spies attempt to open the safe, Blackie presses a switch. Shocked by a powerful electric current, the Russians are held rigid until Kant and help arrive. The spies are they led off in handcuffs. Suspicion falls on Court Orloff. Then, Count Ivan lures the Grand Duchess to his house, and holds her prisoner. Count Orloff heads to Ivan's home, after appealing to Blackie for assistance. Blackie arrives with Kant, and the pair stop Ivan just as he is about to kill Orloff. Blackie realizes that the only thing preventing Orloff and Tatiana from being together is the Romanoff diamonds. If the diamonds are recovered, Tatiana would be obliged to return to Russia and compete for her father's throne. If the diamonds were lost, Tatiana would find happiness with Orloff. So Blackie substitutes paste jewels for the real diamonds. He then convinces both his wife Mary and Kant that he has "turned to the right" by delivering the fake Romanoff diamonds to the United States Government.
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