The Lure (1914)

Charlotte Baker is drugged and taken to a brothel by Paul, her fiance, who in reality is a pimp. To find her, Charlotte's family contacts the celebrated detective Bob Macauley whose sweetheart Sylvia is a struggling salesgirl and the sole support of her ailing mother. When she is turned down for promotion by her boss, Sylvia applies for a position with a kindly woman who has offered her help. To her horror, Sylvia soon discovers that the woman is a madame and has lured her to the same house of ill repute in which Charlotte is being held captive. Meanwhile, searching for Charlotte, Bob visits the brothel disguised as a gasman and discovers that Sylvia is a resident. Thinking that she is there willingly, Bob upbraids her, but upon discovering the truth he rescues her as well as Charlotte and delivers Paul to the authorities.