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.
| Actor | Role |
|---|---|
 Jane LeeJanie O'Dowd | Janie O'Dowd |
 Katherine LeeKate O'Dowd | Kate O'Dowd |
 Franklyn HannaMichael O'Dowd | Michael O'Dowd |
| GGertrude Le BrandtBridget McCann O'Dowd | Bridget McCann O'Dowd |
 Alexander HallMiles O'Dowd | Miles O'Dowd |
| BBeth IvinsPatricia O'Dowd | Patricia O'Dowd |
 Kate LesterMrs. Velma Vanderspent | Mrs. Velma Vanderspent |
| WWilliam PollardAlfred Caesar Vanderspent | Alfred Caesar Vanderspent |
| JJay StrongJerry Flynn | Jerry Flynn |
| AAimee AbbottMrs. Mary Flynn | Mrs. Mary Flynn |
| EEddie SturgisGerman Spy | German Spy |
| RR.R. NeillGerman Spy | German Spy |
 John GilbertNot listed | Not listed |