A runaway truck containing the corpse of a slain gang leader rolls into a California nightclub owned by Johnny Cain, a hard bitten former free-lance adventurer. The gang threatens to kill Johnny, unless he solves the murder. The CIA also investigates - because it turns out that the slaying was part of a long-range Communist plan to take over the crime syndicate. Cain's search for clues leads him into a maze of beautiful girls, mysterious Oriental statues and murderous spies.
Unfortunately the movie The Girl Who Knew Too Much is not yet available on HBO Max.
| Directing | Francis D. Lyon | Director |
| Writing | Charles A. Wallace | Writer |
| Crew | Roger George | Special Effects |
