The Locked Door (1929)

While Ann and her boss' son Frank are out on a ship, Frank makes advances towards her. While she is fighting him off, the ship is raided and the passengers are herded ashore. Almost two years later, she is celebrating her first anniversary when her sister-in-law announces that she is in love--and her beloved turns out to be Frank. Ann decides to save her sister-in-law from a fate worse than death.