Two young English nurses, Jane (Pamela Franklin) and Cathy (Michele Dotrice) embark 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 up but when Jane returns to the village where they are staying, her friend is nowhere to be found. Frantic, she searches for Cathy, but who can she trust, and will she find her in time?