Little Kate and Janie O'Dowd are sent to their wealthy American uncle, Michael O'Dowd, after their Irish father loses his life on a World War I battlefield. Having been locked accidentally into O'Dowd's munitions plant one evening, the children catch sight of their intoxicated cousin Miles O'Dowd admitting two men into the factory. The girls recognize the two as spies they had seen on the boat to America sending signals to a German submarine. After the spies knock Miles cold, the children trap them in a die-stamping machine until help arrives.
Jane Lee
Janie O'Dowd
Katherine Lee
Kate O'Dowd
Franklyn Hanna
Michael O'Dowd
Gertrude Le Brandt
Bridget McCann O'Dowd
Alexander Hall
Miles O'Dowd
Beth Ivins
Patricia O'Dowd
Kate Lester
Mrs. Velma Vanderspent
William Pollard
Alfred Caesar Vanderspent
Jay Strong
Jerry Flynn
Aimee Abbott
Mrs. Mary Flynn
Eddie Sturgis
German Spy
R.R. Neill
German Spy
