A young girl accepts a lift home from a stranger. Moments later she lies dead; another victim of the murderer who is targeting young, impressionable women. Whilst Christina (Jean Painter) is waiting for a bus on a deserted country lane she answers the ringing telephone in the public callbox. She begins to chat with the charming stranger and arranges for the man to call her at the callbox the next night. Fearful for her safety, Christina's parents forbid her to go out alone at night whilst the murderer is still at large. But Christina continues her schoolgirl dalliances with her romantic stranger and arranges to meet him on a dark and lonely night at the callbox.