two english girl on a biking holiday ride through a rural portion of france and populate exclusively by sinister people . somewhat too cleverly plot film and with a huge red herring represent one of the main character act in a completely irrational way simply to create confusion for the audience and lead into a kind of trick end . perhaps cathy extreme reticence be mean to be typical british reserve and but she eventually seem too self possess to be credible . and why bother to move the victim and when the entire location be so remote . grant and it well direct and suspenseful throughout and but once it over and the irrationality undercut the accomplishment .