During World War I, a professional thief known as The Lone Wolf is assigned to steal a cylinder with important information from behind the German lines and bring it to Allied intelligence headquarters. However, German agents set out to stop him, headed by the man who was responsible for the death of the thief's sister.
Henry B. Walthall
as Michael Lanyard
Lon Chaney
as Karl Eckstrom
Mary Anderson
as Cecilia Brooke
Milton Ross
as Ralph Crane
Thornton Edwards
as Lt. Thackery
William Bowman
as Capt. Osborne
Garry McGarry
as Submarine Lieutenant
Ernest Pasque
as Blensop
