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.
as Janie O'Dowd
as Kate O'Dowd
as Michael O'Dowd
as Bridget McCann O'Dowd
as Miles O'Dowd
as Patricia O'Dowd
as Mrs. Velma Vanderspent
as Alfred Caesar Vanderspent
as Jerry Flynn
as Mrs. Mary Flynn
as German Spy
as German Spy
