Young English nurses Jane (Pamela Franklin) and Cathy (Michele Dotrice) are on a cycling holiday in the French countryside. They happen upon a mysterious man, Paul (Sandor Eles), who seems interested in them. Cathy is intrigued by the man, but suspicious Jane wants to continue on the journey. The two split apart after arguing the point, but, when Jane returns to the village where they're staying, her friend is nowhere to be found. Frantic, she searches for Cathy. Will she find her in time?