Young Billy Burns is in love with Irene Brander, to whose father he is private secretary. Irene returns his affection, but is very much afraid that her father will force her to marry Bert Austin, a young society and club man of his choice. Billy, seeing that this is imminent, goes boldly to Irene's house and asks her father for her hand.

When Marcel, a waif, saves master crook Burke from the police, Burke adopts the youngster and teaches him his profession. Years later, Marcel has become a master crook himself, working under the name of Michael Lanyard. His clever work baffles the Paris police, who dub him "The Lone Wolf". The Pack, a gang of criminals, notifies The Wolf that unless he joins them, he is marked for destruction. Lucy, an undercover agent masquerading as a crook to expose the gang, helps The Wolf escape. This inaugurates a series of adventures in which Lucy and The Wolf are pursued by the gang, finally making their escape to England by plane. The Pack follows, only to meet their death in a plane crash. Liberated from his tormentors, The Wolf vows to go straight and marries Lucy.

Having forced Jim Carson to leave town in order to avoid a trumped-up embezzling charge, now Albert Temple is rid of his only serious rival for Helen, whom he soon marries. Jim goes to Alaska, where he adopts Bob Adams, the son of a murdered friend, and then makes a fortune in a gold strike. After eighteen years in the Yukon, Jim returns to his hometown with Bob, who falls in love with Helen and Albert's daughter Dorothy. Because he so hates Albert, however, Jim refuses to consent to a marriage between Bob and Dorothy until Helen tells him that Albert is not the young woman's father. In reality, Dorothy is Jim's own daughter, and when he learns this, Jim quickly changes his mind about the marriage.