- A girl seeks revenge after a Wall Street broker had falsely accused her father and sent him unjustly to prison.
- Mary Dawson is determined to repay Jim Franklin for sending her father to Sing Sing in violation of a promise to drop his charges of theft. She and fellow crook Boston Blackie steal some gold being shipped to Franklin to satisfy his creditors. However, Daniel Regan, the ship's purser who unwittingly aided Mary in her theft, is arrested and accused of the crime. Mary and Boston Blackie return the gold in order to clear Regan, while Franklin commits suicide when the gold is delayed.—Pamela Short
- Boston Blackie and Mary Dawson, a pair of crooks, attend a party at the Long Island home of the wealthy Mrs. James Franklin. There, they steal the famous Cyclops diamond, owned by Mrs. Franklin. Her husband, a ruthless Wall Street broker, is informed of the theft and heads home. At the same time, Mary's father, reformed crook Tom Dawson, returns to New York from a sanitarium. Franklin is attacked by a thug, and Dawson intercedes, chasing away the robber. But Franklin accuses Dawson of the attack, and the man is sent to prison. Franklin promises to get Dawson released if the diamond is returned. Mary does so, but Franklin does not keep his side of the bargain. When Dawson dies in prison, Mary swears revenge on Franklin. She and Blackie know that Franklin is being pressed by creditors, so they arrange to steal a consignment of gold which is being shipped to him from England. The pair travel to London, and accustom themselves to the ship. Mary poses as a collector of rare books and gets in the good graces of the ship's purser, Dan Regan. Regan falls for her. As the ship heads to the States, Mary tells Regan she has a trunk filled with rare books. Regan allows her to stow it in the strong room where the gold is kept. Meanwhile, two British crooks, Arthur Cumberland and Donald Gordon, have their sights set on the gold. Just as Blackie and his assistant "Handsome Harry" Hawkes attempt to remove the gold, they encounter Cumberland and Gordon. After a terrific fight, both Cumberland and Gordon are knocked out. Blackie and Hawkes transfer the gold to Mary's trunk. As the ship nears New York, Mary gets Regan to move the trunk to her state room. There, she is met by six chorus girls, all equipped with bandoliers. When the boat docks, Cumberland and Gordon are arrested for the robbery, while Mary, Blackie, and the six girls walk off with the gold. At Mary's home, she, Blackie and Hawkes decide how to divide the gold. The police discover that Cumberland and Gordon had nothing to do with the theft. Suspicion then falls on Regan, who had asked the Captain for the key to the strong room. When Mary hears this, she does not want the same fate for Regan that befell her father, and Blackie agrees. So Mary and Blackie return the gold, and pay for Regan's defense, leaving them almost broke. Franklin commits suicide. Mary and Blackie get married.
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