Actress and model Lesley-Anne Down was fairly hot in the mid 70's. Today I doubt most people would have a hard time even recalling exactly who she was and what she appeared. Down was chiefly known for appearing in the British upper class/lower class drama Upstairs, Downstairs. That show was the Downton Abbey of it's day and was very popular on P BS, sound familiar?
Down tried to use her popularity on that show to jump into a film career. She did a number of supporting roles in films before she got her big break in the film Sphinx. Sphinx was directed by a fairly decent director, Franklin J, Schaffner who had directed Patton and was based on a novel by the then hot writer Robin Cook. Sphinx is a thriller set in Egypt about the illegal buying and selling of ancient artifacts, Lesley-Anne Down plays a noted Egyptologist who just happens to look like a hot model. She pretty much throws any credibility this film has into the garbage.
On the positive side for this film, it is extremely well photographed and is if anything a nice record of all the traditional tourist hot spots of Egypt, the Pyramids, The Valley of the Kings, Cairo, etc. On the negative side the plot has a lot of holes and coincidences that it really stretches credibility to the point of maximum tensile strength.
Lesley-Anne Down couldn't carry this film and it was back to TV movies and mini series for her after Sphinx flopped at the box office. Another example of a film with a miscast actor that suffered from the miscasting.