Canadian World War II veteran John Graham works in London as a code breaker. Tragedy strikes when his pregnant wife, Carol, is accidentally run over by two crooks who are speeding away from the scene of a murder. Haunted, grieving, and thirsting for revenge, Graham sets out to find the two fugitive murderers.
| Actor | Role |
|---|---|
 Robert PrestonJohn Graham | John Graham |
 Elizabeth SellarsCarol Graham | Carol Graham |
 Colin TapleyInspector Davis | Inspector Davis |
 Sheila BurrellLorna Dawson | Lorna Dawson |
 Harold LangMickie Fraser / Kid Python | Mickie Fraser / Kid Python |
 Mary GermainePeggy Reece | Peggy Reece |
 Stanley BakerMilkman | Milkman |
 Edith SharpeMrs. Reece | Mrs. Reece |
| EEdward LexyCardew | Cardew |
| LLyn EvansChuck Peters | Chuck Peters |
 Thomas HeathcoteJackie | Jackie |
 George WoodbridgeSgt. Ritchie | Sgt. Ritchie |
 Noel HowlettJohnson | Johnson |
| CCharles SaynorConstable | Constable |
 Martin BoddeyDesk Sgt. | Desk Sgt. |
 Robert BrownCarter | Carter |