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Anita Stewart plays the title character. Mary Regan is the daughter of a gentleman crook and an heiress. Although she has received a good upbringing, she refuses to marry Robert Clifford (Frank Mayo) for fear of damaging his career as a city official. Some old associates of her father, Peter Loveman (George Hernandez) and Jim Bradley (Brinsley Shaw), want her to help them in their blackmailing schemes. She won't, and escapes from her trying situation by going to the mountains for a rest. Bradley brings up a reckless young man, Jack Morton (Carl Miler). Jack falls in love with Mary and proposes marriage. Mary, wanting to save him from the crooks he befriends, and wanting to save Clifford a lot of trouble, accepts Jack's offer. Mary later finds out about a scam that the crooks are trying to pull off on the wealthy Morton family and tells Clifford about it. He gets the police involved and they halt the crime. Meanwhile, Jack dies from his fast-living ways, freeing Mary to finally follow her heart and be with Clifford.