Mary Doone (Theda Bara) is a poor British girl who runs away from her adopted family because the father made a pass at her. She lives at a parish house, and at the outbreak of World War I, she becomes a Red Cross nurse.
| Actor | Role |
|---|---|
 Theda BaraMary Doone | Mary Doone |
 Franklyn HannaDoctor | Doctor |
 Stuart HolmesLloyd Stanley | Lloyd Stanley |
 Walter LawLongshoreman | Longshoreman |
 Madeleine Le NardEthel Wardley | Ethel Wardley |
| CCarey LeeLongshoreman's wife | Longshoreman's wife |
 Jane LeeNaughty girl | Naughty girl |
 Katherine LeeLongshoreman's daughter | Longshoreman's daughter |
| LLucia MooreLady Clifford | Lady Clifford |
 A.H. Van BurenElliot Clifford | Elliot Clifford |