And Soon the Darkness (1971)

Two British nurses have decided to bike through the France on holiday, taking less traveled routes to see the real France rather than tourist traps. Because one is a "stick to the plan" type and the other would prefer to be more spontaneous, they have an argument resulting in one pedaling on ahead while the other stays behind to sunbathe. When the more responsible friend decides to go back to collect her friend, she's nowhere to be found.

Though the atmosphere was effective and the language barrier added a believable dash of confusion, the script relied too heavily on red herrings. Since there are only about half a dozen people in the film, this means that everyone's a suspect. It stretched believability to the breaking point: I would've been frustrated if I'd been at all invested.

C