The Island of Intrigue (1919)

When oil magnate Thomas Waring receives a letter from his old friend, Mrs. Juliet Smith, suggesting that his beloved daughter Maida spend her vacation at Mrs. Smith's island home, Waring encourages Maida to accept as he has to go East on business. After Mrs. Smith supposedly gets Maida, Waring receives a call from the real Mrs. Smith, who says that Maida has left with an impostor. On the island, Maida lives luxuriously, unaware that her hosts are sending her father ransom notes. She meets Gilbert Spear, camping out, and they fall in love. After receiving no response from Waring, the kidnappers reveal their scheme to Maida and demand that she write to her father. They lock her in when she refuses, but she escapes and leaves the island with Gilbert. Although they are overtaken by the criminals, Waring and the police pull up and the gang is taken into custody, leaving Gilbert and Maida free to pursue their romance.