During World War 1, the young Boudreau sisters decide to aid the war effort by catching spies. The strange activities of Nobel-Prize winning scientist Maria Skłodowska-Curie make her a prime suspect. When the girls follow Curie to the battlefront, they witness her fight to use science and her X-ray machine to save the lives of the wounded, including their father.
| Actor | Role |
|---|---|
 Kate TrotterMaria Skłodowska-Curie | Maria Skłodowska-Curie |
 Natalie VansierMartine Boudreau | Martine Boudreau |
 Colleen RennisonEliane Boudreau | Eliane Boudreau |
 Dawn GreenhalghMrs. Yolles | Mrs. Yolles |
 Martha BurnsLisette Boudreau | Lisette Boudreau |
| PPaul KennedyDoctor | Doctor |