The Lone Wolf's Daughter is a surviving[1] 1919 American silent era crime/drama/thriller motion picture starring Bertram Grassby, Louise Glaum, and Thomas Holding.

Earle and produced by J. Parker Read Jr., the screenplay and the intertitles were adapted by Louis Joseph Vance based on his novels about the Lone Wolf, a jewel thief turned private detective.

When Sonia learns of the gang's diabolical plan to have poisonous gas pumped into the Houses of Parliament, the homes of Downing Street and of the nobility, even Buckingham Palace, in order to clear the way for Victor to become England's dictator, she tells Karslake.

Following Sonia's recognition of her father, the Lone Wolf, he and Karslake capture the gang amidst a blazing house fire and a huge fight.

Much of the action takes place in Soho, the French quarter of London, where Sonia (Louise Glaum) who knows nothing of her parentage or past, is the attraction for the curious slumming parties.

The plot centers about Sonia's captivity in the house of a celebrated crook, her discovery of mysterious maneuverings to poison all London, and the intense climax which follows directly after her recognition of her father, "The Lone Wolf", who has been working, unknown to her or by her, in the same household.