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.
Hazel Dawn
Lucy Shannon
Bert Lytell
Michael Lanyard
Stephen Grattan
Burke
Alfred Hickman
Eckstrom
Riley Hatch
De Moribar (as William Riley Hatch)
Edward Abeles
Ducroy
Florence Ashbrooke
Mme. Troyon
Juliet Brenon
Thibault's Maid
Cornish Beck
Marcel
Ben Graham
Thibault
Robert Fisher
Bannon
Joseph S. Chailee
Popinot
William E. Shay
Wertheimer
