An Adventure in Hearts (1919)

When Captain Dieppe, an American agent of French descent, refuses to divulge confidential information he gathered for a small Italian principality until they pay him, he is pursued by secret service agent Guilamo Sevier to Fieramondi in Northern Italy. Dieppe agrees to help the lonely Count Fieramondi convince his wife to return from her isolated wing of their castle. The countess, after convincing her cousin Lucia to take her place in the castle, goes to Rome to raise money to pay Paul Sharpe, who is blackmailing her because of her gambling debts. Dieppe falls in love with Lucia, whom he thinks is the countess, and after he fights Sharpe and steals the evidence of the debts, he sacrifices his own love by preparing a reconciliation between the count and the countess. After Dieppe obtains his money from Sevier, the real identities are revealed. Finally the count and countess are reunited, while Dieppe and Lucia maintain their romance.